Shocker 21K HD Air Trailer Tongue Mount & Demco Coupler for 2-5/16″ Ball

Name: Shocker 21K HD Air Trailer Tongue Mount &amp; Demco Coupler for 2-5/16" Ball
Brand: Shocker Hitch
SKU: SH-HD4000-D14040-81-B
Availability: InStock
Rating: 4.95 (20 reviews)

Rated 4.95 out of 5 based on 20 customer ratings

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Shocker 21K HD Air Trailer Tongue Mount - Vertical Channel & Demco Coupler - Side

Shocker 21K HD Air Trailer Tongue Mount & Demco Coupler for 2-5/16″ Ball

Rated 4.95 out of 5 based on 20 customer ratings

(20)

$774.99~~$853.99~~

Usually Ships on or Before Mon 09/21/26

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Additional Add-Ons

Shocker 20K Pintle Ring with Hardware - 3" I.D. - Channel Mounted (B16140)

HD 10-Ton 3" Pintle Ring - Vertical Channel Mount - 20,000 lbs

$47.99

SKU: SH-P20000-B

Vertical Channel Weld On Tongue Adapter - SH-410-Welded

Vertical Channel Complete Weld On Tongue Adapter for Trailer A-Frames

$76.00

SKU: SH-410-Welded

HD Bolt on Vertical Channel Tongue Adapter for Aluminum Trailer A-Frames (Shown Black Powder Coat & Installed)

HD Bolt on Vertical Channel Tongue Adapter for Aluminum 50° Trailer A-Frames

$129.59

SKU: SH-430-BLK

Description
Product Description
- Smoother Towing Every Mile with Bolt-On Air Ride for Bumper Pull Trailers: Travel a lot on roads or concrete highways? No more jarring every time you cross a section divider. The Shocker HD air tongue mount with ball coupler cushions absorbs the bumps, jerks, bounces & sways by filtering and dampening them through a built-in air ride system. This creates a safer, smoother towing experience.
- Auto Latching Demco 2-5/16″ Ball Coupler – Heavy-Duty 21,000 lbs GTW & 2,100 lbs TW: Made for heavy-duty trailer towing to handle the roughest roads with ease. Bolt-on Demco coupler for 2-5/16″ ball features an ez latch auto latching design. Lower coupler and it auto latches onto ball. Flip latch up to easily release from ball. Composite style latch is durable & impact resistant.
- Heavy Duty Design for Equipment Trailers & More: Great for heavy duty trailers, farm applications, race trailers, stackers, end dumps, equipment trailers & flatbed trailers equipped with 3″ vertical channel or 4 bolt flat plate on front of trailer tongue.
- Easily Adjust for Trailer Weight, Best Ride & Load Control: Fine-tune the PSI for best ride, load control & trailer weight. Just add air pressure for heavier loads and reduce air pressure for lighter loads. When you are towing a trailer, the road bumps and jerks displace the weight. An air hitch absorbs this and cushions it so that when a bump causes the weight to come off the front of your vehicle, it can put too much tongue weight on it. An air hitch absorbs this. Without an air hitch, this can result in poor steering and braking. When a bump causes the weight to be displaced and put too much weight on the rear trailer tires. An air hitch absorbs this. Without an air hitch, this can cause your trailer to sway.
- Quickly Mounts to Front of Your Trailer Tongue: 2 Mounting Options: Vertical Channel Mount: For Trailers with 3-1/2″ Wide Vertical Channel, most use 5/8″ bolts or pins that are 4-1/2″ long for mounting to trailer. This option fits 3″ wide ID / 3-1/2″ wide OD vertical channel on front of trailer with 2″ center on center bolt pattern. (Need a Vertical Channel? Optional Part # SH-410-C Optional Weld-on Vertical Channel Kit Available – Sold Separately). 4 Bolt Flat Plate Mount: For Trailers with a square flat plate mount with a 4-1/2″ square bolt pattern. For Trailers with 4a Bolt Flat Plate, The Size & Length of Bolts Needed Vary By Trailer. Generally 5/8″ diameter by 4″ long. (DOES NOT Include Trailer Mounting Bolts).
- Reduces Stress, Breakage, Wear & Tear on Truck, Trailer, Cargo & Equipment: This tongue mount air coupler reduces damage on pickup truck, driveline, trailer and frame. The shock-absorbing & dampening design creates less stress on the tow vehicle and trailer. Less stress means less wear and tear on both the tow vehicle and the trailer frame and welds. It’s a must-have for trailer frames that tend to crack because of rough roads with a traditional hard truck-to-trailer connection. This air ride tongue mount coupler will greatly reduce the chances of frame cracking and breaking.
- Less Stress on Passengers & Animals: Passengers & animals experience less stress while being towed. The shock-dampening design effectively absorbs the jerking, tugging, bumps, and damaging forces experienced when towing on rough roads and concrete highways, which you would normally feel with a typical hard connection. This makes the ride smoother and less stressful inside the tow vehicle and inside the trailer.
- Simple & Effective Pivoting, Shock Absorbing Design: Filters, dampens & absorbs the road shock through the air ride system & urethane cushions with the greaseable 1″ diameter pivot bolt. Uses a rocker arm pivot design to work with the air ride system. The heat treaded harden, greaseable 1″ diameter 1045 carbon steel pivot bolt used in the Shocker HD air tongue mount coupler is heat treated to prevent wear & has machined grease passage for easy lubrication. The yield strength of the 1″ pivot bolt exceeds the two 5/8″ bolts used to hold the typical ball coupler on the average vertical channel adapter.
- Saves Money & Improves Fuel Economy: Save money with less breakage and improved fuel mileage. Trailer couplers, A-frames, along with all the welds on steel or aluminum, um can be very expensive to fix. If welds break while towing a trailer, very dangerous. An air ride coupler can reduce the chances of breakage, which can save you a great deal of money. Customers report fuel savings of 1 to 2 miles per gallon.
- HD Tongue Mount Air Coupler Includes: Air ride HD tongue mount with mount style selected, bolt-on Demco coupler for 2-5/16″ ball with four 1-1/2″ x 5/8″ bolts & lock nuts for securing coupler to tongue mount. Trailer mounting hardware not included.
- Can Be Used with a Weight Distribution Hitch: If your pickup is squatting with the trailer & you need a WD Hitch, this tongue mount air coupler will work with a weight-distribution hitch.
- Matte Black Textured Powder Coat Finish: Impact-resistant premium matte black textured powder-coat finish on tongue mount and components.
- Safety Notice: Towing capacity is limited by the lowest rated component. Manufactured by Shocker Hitch® USA in Jamestown, ND.
FAQ for Bumper Pull Trailer Towing
Turn your bumper pull trailer into an air ride trailer in minutes and get smoother towing every mile. Bolt-on air ride with the Shocker HD air trailer tongue mount with a Demco coupler for a 2-5/16″ ball. Ideal air ride coupler for end dump trailers, stacker race trailers, cargo trailers, skid steer, tilt, equipment & flatbed trailers with a 3″ vertical channel or 4-bolt flat plate on the front of the trailer tongue. The heavy-duty Shocker Air trailer tongue mount with an auto-latching Demco ball coupler for a 2-5/16″ ball is great for absorbing bumps, bounces, jerks & sways. It reduces breakage, damage, wear & tear on the pickup, trailer & cargo that can happen when towing with a traditional hard connection. The advantage of the Shocker HD air coupler is your ability to adjust air pressure for changing trailer weight, best ride, and load control. The Shocker HD air tongue mount is a miniature air suspension unit mounted between the truck and trailer. This shock-absorbing trailer tongue mount coupler is a must-have for easier, safer & smoother towing. The heavy-duty air ride system is mounted above the trailer tongue for maximum ground clearance. Simply bolts to your trailer a-frame and is ready for whatever truck is pulling it. Choose from the vertical channel or square plate mount (4-1/2″ bolt pattern). The Shocker air trailer tongue coupler attaches to your trailer and is ready for whatever truck is pulling it. 21,000 lbs GTW & 2,100 lbs TW with EZ-Latch Demco coupler.

California Residents: Prop 65 Warning
Videos

Videos
Shocker Air Trailer Tongue Coupler Mount Videos

Install

Installation • Air setup • Maintenance

Get your Air Tongue Mount ready to tow

Follow these Shocker Air Trailer Tongue Mount installation and set-up instructions for vertical-channel and four-bolt square-plate mounts with a Demco coupler, Wallace Forge coupler, or pintle ring. Choose your mounting style below, install your attachment, then set the air pressure with the trailer loaded for towing.

Download 2026 installation instructions (PDF)Set your air pressure

4-page illustrated manual • Revision A, September 3, 2026

Before you start

This guide applies to the products in our Air Trailer Tongue Mount collection, including mounts sold without a coupler and assemblies with 2-inch or 2-5/16-inch ball couplers or a pintle ring. Match the installation steps to your mounting style and attachment.

Vertical-channel mount

SH-HD4000 / SH-4000

Tools: impact driver with 15/16-inch socket, 15/16-inch wrench, and a torque wrench capable of 100 ft-lbs.

Mounting hardware: four 5/8-inch-11 × 4-1/2-inch Grade 8 hex bolts and four 5/8-inch-11 Nylock hex nuts.

View vertical-channel steps

Four-bolt square-plate mount

SH-HD4500 / SH-4500

Tools: impact driver or ratchet with 15/16-inch socket, two 15/16-inch wrenches, and a torque wrench capable of 100 ft-lbs.

Mounting hardware: reuse the existing serviceable square-mount hardware as directed in the manual.

View square-plate steps

Check the hardware and ratings. Do not reuse hardware that is bent, damaged, corroded, worn, or undersized. Never exceed the lowest-rated component in the complete towing system. See the mount and attachment ratings below.

Mounting style 01

Vertical-channel Air Tongue Mount installation

SH-HD4000 / SH-4000

Watch HD Air Ride Tongue Mount Coupler Installation & Set-Up on YouTube

Measure and remove the existing coupler. Park the tow vehicle and trailer on a level surface. Measure the front and back of the trailer and adjust as needed to level it. Record the height from the ground to the top of the truck’s hitch ball and from the ground to the bottom of the trailer coupler. Remove the coupler bolts using an impact driver with a 15/16-inch socket and a 15/16-inch wrench on the nut, then remove the coupler from the vertical channel.
Install your attachment in the Air Tongue Mount. Follow the Demco, Wallace Forge, or pintle-ring instructions below for the correct bolt count, length, and positioning.
Position the assembly and check the height. Align the Air Tongue Mount in the trailer channel. Insert two 5/8-inch-11 × 4-1/2-inch bolts in the top and bottom holes. Measure from the ground to the bottom of the coupler. Move the mount up or down in the channel as needed to match the original coupler-height measurement.
Install the remaining hardware and torque. Insert the remaining two 5/8-inch-11 × 4-1/2-inch bolts through the vertical-channel adapter and Air Tongue Mount. Hand-thread all four 5/8-inch-11 Nylock hex nuts onto the protruding threads. Torque the vertical-channel bolts to 100 ft-lbs, using a torque wrench with a 15/16-inch socket on the nut and a 15/16-inch wrench on the bolt.

Tape measure beside the original trailer coupler showing its height above the ground — Measure from the ground to the bottom of the trailer coupler before removing it.

Removing a trailer coupler from the vertical channel with an impact driver — Remove the mounting bolts and lift the existing coupler out of the trailer’s vertical channel.

Demco coupler being attached to a Shocker Air Tongue Mount on a workbench — Fit the selected coupler to the Air Tongue Mount before positioning the assembly in the trailer channel.

Shocker Air Tongue Mount and ball coupler positioned in the trailer vertical channel — Position the Air Tongue Mount in the vertical channel and check the coupler height against the original measurement.

Installer using a torque wrench on the Air Tongue Mount vertical-channel mounting bolts — Torque the vertical-channel mounting bolts to 100 ft-lbs using a torque wrench.

Mounting style 02

Four-bolt square-plate Air Tongue Mount installation

SH-HD4500 / SH-4500

Remove the existing coupler. Use an impact driver or ratchet with a 15/16-inch socket and a 15/16-inch wrench on the nut. Remove the bolts and the coupler from the trailer’s square mounting plate.
Fit the Air Tongue Mount to the square plate. Insert the existing serviceable bolts through the trailer square mount so the threaded ends face forward. Align the Air Tongue Mount with the bolts and slide it into place until the plate sits flush against the trailer. Hand-thread the existing nuts onto all four bolts, then tighten using a wrench on the bolt head and another on the nut.
Install the coupler and finish tightening. Follow the appropriate attachment instructions below. Torque the tongue-mount bolts to 100 ft-lbs using a torque wrench with a 15/16-inch socket on the nut and a 15/16-inch wrench on the bolt head.
Check towing height on a level surface. Measure the front and back of the trailer and adjust as needed to level it. Compare the height from the ground to the top of the truck’s hitch ball with the height from the ground to the bottom of the trailer coupler. If the measurements do not match, adjust the height of the hitch ball on the truck to achieve the required height.

Existing ball coupler on a trailer square mounting plate before removal — Remove the existing coupler from the trailer’s square mounting plate.

Four mounting bolts protruding from the front of a trailer square mounting plate — Insert the existing serviceable bolts through the trailer square mount with the threaded ends facing forward.

Shocker Air Tongue Mount seated against the trailer square plate with mounting nuts installed — Slide the Air Tongue Mount over the four bolts, seat the plate flush, and hand-thread the nuts.

Ball coupler attached to a Shocker square-plate Air Tongue Mount — Install the selected coupler, torque the tongue-mount bolts to 100 ft-lbs, and recheck the towing height.

Install your coupler or pintle ring

Use the instructions for your attachment. The bolt lengths, quantities, and hole positions differ by attachment type.

Bolt-on Demco coupler

Hardware: four 5/8-inch-11 × 1-1/2-inch Grade 8 hex bolts and four 5/8-inch-11 Nylock hex nuts.

Align the Demco attachment with the holes in the Air Tongue Mount. Use the bottom holes in the Air Tongue Mount for the Demco coupler.
Insert four bolts, two through each side of the Air Tongue Mount. Hand-thread all four locknuts until snug.
Torque the bolts to 100 ft-lbs, using a torque wrench with a 15/16-inch socket on the nut and a 15/16-inch wrench on the bolt head.

Hands aligning a Demco ball coupler and inserting attachment bolts into the Air Tongue Mount — Align the Demco coupler in the Air Tongue Mount and insert four attachment bolts, two through each side.

Close-up of the Demco coupler attachment bolts and locknuts inside the Air Tongue Mount — Hand-thread the four locknuts onto the Demco coupler attachment bolts before final tightening.

Torque wrench tightening a Demco coupler attachment bolt on a Shocker Air Tongue Mount — Torque the Demco coupler attachment bolts to 100 ft-lbs.

Bolt-on Wallace Forge coupler

Hardware: three 5/8-inch-11 × 4-1/2-inch Grade 8 hex bolts and three 5/8-inch-11 Nylock hex nuts.

Align the Wallace Forge attachment with the holes in the Air Tongue Mount. Insert three bolts through the mount and coupler.
Hand-thread all three locknuts onto the bolts until snug.
Torque the bolts to 100 ft-lbs, using a torque wrench with a 15/16-inch socket on the nut and a 15/16-inch wrench on the bolt head.

Wallace Forge ball coupler with three attachment bolts in a Shocker Air Tongue Mount — Align the Wallace Forge coupler and insert the three attachment bolts through the mount and coupler.

Wallace Forge coupler attached to an Air Tongue Mount with three locknuts visible — Hand-thread three locknuts, then torque the Wallace Forge coupler bolts to 100 ft-lbs.

Bolt-on pintle ring

Hardware: two 5/8-inch-11 × 4-1/2-inch Grade 8 hex bolts and two 5/8-inch-11 Nylock hex nuts.

Align the pintle ring with the bottom two holes in the Air Tongue Mount and insert both bolts through the mount and ring.
Hand-thread both locknuts onto the bolts until snug.
Torque both bolts to 100 ft-lbs, using a torque wrench with a 15/16-inch socket on the nut and a 15/16-inch wrench on the bolt head.

Pintle ring aligned in the lower attachment holes of a Shocker Air Tongue Mount — Use the bottom two attachment holes and insert the two pintle-ring bolts.

Two locknuts on the pintle-ring attachment bolts of a Shocker Air Tongue Mount — Hand-thread the two locknuts onto the pintle-ring attachment bolts until snug.

Installer using a torque wrench to tighten pintle-ring bolts on a Shocker Air Tongue Mount — Torque both pintle-ring attachment bolts to 100 ft-lbs.

Watch HD Air Ride Pintle Tongue Mount Installation & Set-Up on YouTube

Set the air pressure for your trailer load

Set the Air Tongue Mount with the trailer loaded as it will be towed. The correct setting is based on the position of the bump stops and washers.

Keep hands and clothing away from moving hitch parts. Do not exceed 100 PSI in the air spring bag.

Load the trailer and secure the cargo.
Couple the trailer to the tow vehicle on level ground.
Add air to the air spring bag until the black bump stops contact the black-painted tabs on the hitch frame, or until the split lock washers are compressed flat.
Adjust for demanding conditions if needed. In strong headwinds or unusually demanding conditions, a small pressure increase may improve support and stability. Stay within the 100 PSI maximum.

**Where to add air:** Connect your air hose to the inflation valve marked by the arrow.

Arrow pointing to the top of the washer between the bolt head and bump cushion on a Shocker Air Tongue Mount — **Washer reference:** The arrow points to the top of the washer between the bolt head and bump cushion. With the loaded trailer coupled, add air until the split lock washers are compressed flat, as described above. Tap the photo to enlarge.

Do not use air pressure to compensate for an overloaded trailer, inadequate tongue weight, improper trailer loading, or an incorrectly rated towing connection.

Watch How to Set the Air Pressure in Your Shocker HD Air Trailer Tongue Mount on YouTube

Using the Air Tongue Mount with weight distribution

Load the trailer and secure the cargo as it will be towed.
Park the tow vehicle and trailer on level ground.
Couple the trailer to the tow vehicle.
Add air to the Air Tongue Mount’s air spring bag using the air-pressure steps above.
Connect the tension and weight-distribution spring bars.
Continue adding air until the desired ride and towing behavior are reached. Do not exceed 100 PSI.
Recheck the tow vehicle and trailer, weight-distribution adjustment, and Air Tongue Mount position.
Verify adequate clearance for the weight-distribution bars, brackets, safety chains, breakaway cable, and electrical wiring.

Never exceed the weight rating of any component.

Before every tow

Park the tow vehicle on level ground whenever practical.
Confirm that the Air Tongue Mount, coupler, ball or pintle connection, safety chains, trailer, tires, and tow vehicle are all properly rated for the intended load.
Ensure the coupler is fully engaged and locked on the correct hitch ball or approved pintle connection.
Before towing, slowly turn the tow vehicle fully in both directions. Check that the safety chains, breakaway cable, electrical wiring, coupler or pintle ring, and Air Tongue Mount have adequate clearance without binding, stretching, or contacting the trailer.
Raise and secure the jack properly and completely.
Inspect the Air Tongue Mount, coupler, mounting bolts, air spring bag, and trailer tongue for damage, missing hardware, looseness, cracks, or excessive corrosion.
Verify that all mounting and coupler fasteners are torqued to the specification in this guide: 100 ft-lbs.

Maintenance & replacement parts

Lubrication

Coupler and hitch ball: lubricate before each hookup to reduce friction, wear, and noise. After use, clean dirt, rust, and old contaminated grease from the hitch ball.

Main pivot bolt: apply grease through the grease zerk on the main pivot bolt to reduce pivot wear and maintain smooth movement.

Lubricate all applicable grease points every 2–3 months, or more often in heavy-use, off-road, wet, or dusty conditions.

Air spring inspection

Inspect the rubber bellows for rubbing, cuts, cracking, abrasion, leaks, debris, or loose fittings.

Check air pressure with the trailer loaded as it will be towed. Do not exceed 100 PSI in the air spring bag.

Replacement parts listed in the 2026 guide

SH-204 replacement air spring bag with rubber bellows and metal mounting plate — SH-204 replacement air spring bag for the 25K HD Tongue Mount, as listed in the 2026 guide.

SH-202-X replacement air spring bag for the Shocker Air Tongue Mount — SH-202-X replacement air spring bag for the 14K Tongue Mount, as listed in the 2026 guide.

Replacement pivot bolt with locknut and washer for the Shocker Air Tongue Mount — SH-490 replacement pivot bolt kit for the Shocker Air Tongue Mount.

Air Tongue Mount bump cushion kit with two rubber cushions, bolts, washers and nuts — SH-1170 replacement bump cushion kit for the Shocker Air Tongue Mount.

For help matching a replacement part to your hitch, call 701-707-2666 or contact Shocker Hitch.

Weight ratings & safety

Never exceed the lowest-rated component in the complete towing system. The mount and attachment combination determines the hitch’s maximum capacity. Do not exceed the rated capacity of the hitch, tow vehicle, trailer, ball or pintle connection, or any other towing component.

HD Air Tongue Mount

SH-HD4000 / SH-HD4500

Up to 25,000 lbs gross trailer weight (GTW)
Up to 2,500 lbs tongue weight (TW)

Air Tongue Mount

SH-4000 / SH-4500

Up to 14,000 lbs gross trailer weight (GTW)
Up to 1,400 lbs tongue weight (TW)

Attachment ratings

Coupler and pintle-ring capacities from the 2026 installation guide
Attachment / part number	Connection	GTW rating
Wallace Forge Heavy Duty W25625-B	2-5/16-inch ball	25,000 lbs
Wallace Forge Medium Duty W25620-B	2-5/16-inch ball	20,000 lbs
Demco Heavy Duty D15791-81-B	2-5/16-inch ball	21,000 lbs
Shocker Pintle Ring P2000-B	3-inch pintle ring	20,000 lbs
Demco Heavy Duty Cast D14040-B	2-5/16-inch ball	21,000 lbs
Wallace Forge Medium Duty W20012-B	2-inch ball	12,000 lbs

Example: fitting a 20,000-lb coupler to a 25,000-lb HD mount does not create a 25,000-lb hitch. Follow the lower applicable rating.

View all compatible Air Trailer Tongue Mount products

Need help with your tongue-mount setup?

Have your mount model, coupler type and trailer details ready. Photos of the air valve and bump cushions or washers help our team with air-pressure questions.

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Download installation instructions (PDF)Register your warranty

Instructions based on the Shocker Air Trailer Tongue Mount Installation Instructions, September 3, 2026, Revision A.