Shocker Gooseneck Air Hitch & Coupler for Diamond C Trailers

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Product Information:

List Price: $1,149.99$1,359.99Sale Price: $1,099.99$1,299.99Free Ground Shipping*

Rated 5.00 out of 5 based on 3 customer ratings
SKU: SH-G-Diamond-C


Product Description

  • Smoother Safer Towing: Improves your ride, reduces wear & tear on pickup & trailer made by Diamond C Trailers.
  • Easy Install: Completely replaces your factory gooseneck stem & coupler with Gooseneck Surge Air System & Coupler. Installs in Minutes.
  • Absorbs Road Shock: Helps eliminate tugs, jerks & bumps felt when towing on rough roads or concrete highways.
  • Up to 40,000 lbs & 7,000 lbs tongue weight: Available with 30k dual latching Shift Lock gooseneck coupler for 2-5/16″ ball. Patent #’s 11,370,257 B1 & D898,628. 9″ offset coupler option has 6,000 lbs TW.  2-5/16″ coupler offers 30,000 lbs GTW and 3″ coupler offers 40,000 lbs GTW.
  • Built in Airbag: This hitch directs the tow resistance through an airbag, producing a smooth ride.
  • Air Ride Technology: Protects your truck, gooseneck trailer and the contents with a smoother, safer tow. Heavy loads, just add air. The cure for choppy, bouncy, buckled, rough & busted up roads. No more booms, bangs and jerks when towing with your gooseneck.
  • Improves Safety: By giving you improved control of your tow vehicle and trailer. The Gooseneck surge air hitch system allows for better control of your pickup and the trailer it is towing.
  • Shock Dampening Action: Gooseneck air hitch effectively absorbs the jerking, tugging and damaging forces experienced with a typical hard connection when towing trailers. There is no reason to beat yourself or your equipment up with a hard connection.
  • Saves Fuel: By using a gooseneck Surge Hitch, you may save as much as one mile per gallon. When we developed the Surge Hitch our intention was to give a smoother ride, period. We perfected that and never considered the other benefits. Customers using the Surge hitch started calling with reports of better fuel mileage. Claims of up to a mile per gallon are pretty normal.
  • Adjustable for Tow Weight: The air bag sits behind your gooseneck hitch and out of the way. You will find the advantage of the Air Shocker is your ability to adjust air pressure for best ride and load control. View our Shocker Air Pressure tuning guide.
  • Provides Comfort: With a smoother ride! Travel a lot on concrete highways? No more jarring every time you cross a section divider. Your Shocker air hitch absorbs the thumps, bumps and jerks you feel when towing your gooseneck trailer.
  • Simple Pivot Design: Uses a rocker arm pivot design which produces a front and back motion, much different than other cushion hitches on the market. Our design eliminates the need for parallel linkages, shock absorbers, torsion arms and other over engineered gadgets.
  • Choose for 2-5/16″ or 3″ gooseneck hitch balls: & has 3 height adjustment holes. (Standard Shift Lock™ coupler extends 3″ forward from your factory coupler or choose 9″ extension for short bed pickups). 2-5/16″ coupler offers 30,000 lbs GTW and 3″ coupler offers 40,000 lbs GTW.
  • Shift Lock™ Coupler: Patented gooseneck coupler. The only gooseneck coupler that captures ball on both sides. At a glance, you can see if the coupler is locked on the ball. Easy to use handle to hook up and disconnect the coupler from the ball.
  • Includes complete Shocker Gooseneck Surge® air hitch with built in airbag, replacement inner tube stem & Shift Lock™ gooseneck coupler. Choose for 2-5/16″ or 3″ ball.
  • Adds Life To Your Vehicle & Gooseneck: By reducing wear and tear on driveline and frame! Treat yourself, your equipment, and your passengers to a much smoother ride. You’ll never go back to the ‘old days’ of continual bumps, jerks, and vibrations. Join the list of satisfied customers that are using Shocker hitches. Order one today and get ready for your ultimate smooth towing experience the next time out.
  • Saves Money: By reducing trailer breakage on both the trailer and the trailer contents! The Shocker hitch absorbs the damaging forces experienced with a typical hard connection. This greatly reduces the chances of breaking welds and doing other long term damage to your equipment as well as the valuable cargo you have inside the truck and trailer.
  • STEM SELECTION: Available for 4″ Round, 4″ or 4.5″ Square Diamond C Gooseneck Flatdeck & Dump Trailers. A few 2021 models have 100mm (3-15/16″) round stems. Not sure what size round gooseneck stem you have? Check out our gooseneck stem selection guide.
  • Have a different trailer brand? Click this link to Find Your Gooseneck Surge Air Hitches by Trailer Mfg

Air ride upgrade for your Diamond C gooseneck trailer. The revolutionary Shocker Gooseneck Surge® air hitch & coupler is the ultimate in gooseneck trailer towing for your Diamond C gooseneck trailer. Available with 30,000 lbs to 40,000 lbs GTW. This shock absorbing cushion hitch is the only air ride hitch to exclusively work in a forward and back motion, which is often times this is the biggest jerk you feel when towing a gooseneck trailer. Works great on Diamond C dump, flatbed, tilt & deck over  gooseneck trailers. The built in airbag absorbs the road shock and filters the bumps through the airbag creating a smoother, safer towing experience for you, your pickup, your trailer & the contents.  Featuring the patented Shift Lock coupler for a 2-5/16″ or 3″ hitch ball and completely replaces the factory 4″ round, 4″ square 4.5″ square stem & coupler on a Diamond C gooseneck trailers.  The shock absorbing hitch for a Diamond C flat bed or dump gooseneck trailer is made for smooth and safe towing whether you are towing occasionally or a hot shot truck driver hauling cargo all over the country. Works great on Diamond C gooseneck style end dumps & flatbed trailers. Fine tune for your weight, heavier loads just add air. Even saves fuel, as customers report 1 mile or more per gallon improvements.

The gooseneck surge hitch & coupler completely replaces your Diamond C factory stem & coupler. It Installs in minutes. Manufactured by Shocker Hitch® in the USA.

  • Patent #’s 11,370,257 B1 & D898,628.

Note:  Diamond C gooseneck trailers have 4″round stems with angled / slotted hole for the pin, and a 4″ or 4.5″ square tube stem with top crank. Some 2021 Diamond C trailers have 100mm stems with angled holes. The Shocker gooseneck surge air hitch attaches easily to your trailer in minutes. Replacement inner tube stem has 3 adjustment holes and the coupler extends 3″ forward from factory location or you can also order it with a 9″ offset coupler for short bed pickup trucks.

California Residents: Prop 65 Warning


Shocker Gooseneck Surge Air Hitch & Coupler Videos


Shocker Gooseneck Surge Air Hitch & Coupler Installation

When used properly these Gooseneck surge air hitch will make noticeable improvements in your gooseneck trailer towing quality. Giving both truck and trailer a smoother ride with less trailer fatigue and breakage.

Install a Gooseneck Surge in Minutes

How to Air Up Gooseneck Surge Air Coupler?

Gooseneck Surge Air Pressure:

  • This is a LOW-PRESSURE hitch, that works by tow resistance.
  • Set air pressure at approx. 15 psi, then test drive.
  • Increase pressure in 5 psi increments until optimum results are found.
  • Typical air pressure range is 5 – 15 psi.
Note: When towing heavy trailers or trailers with high wind resistance it may be necessary to increase air pressure in the Shocker. Maximum Pressure: Do not exceed 100 psi in the air bag, as it may damage the air bag.

Gooseneck Surge Stem Selection Guide Video

Download Gooseneck Surge Installation Manual

Maximum weights for Shocker Surge: 30,000 lbs GTW & 7,000 lbs Tongue Weight for Patented 30,000 lbs Shift Lock™ coupler for 2-5/16″ gooseneck ball (Offset 2-5/16″ coupler tongue weight is 6,000 lbs). 40,000 lbs GTW & 7,000 lbs Tongue Weight for Patented 40,000 lbs Shift Lock Coupler for 3″ gooseneck ball. For the QuickAir 5th To Gooseneck Air with Shift Lock™ coupler for 2-5/16″ gooseneck ball  it is 24,000 lbs GTW & 6,000 lbs Tongue Weight. Patent #’s 11,370,257 B1 & D898,628. Safety Notice: The Shocker Hitch is a heavy-duty unit, however, it is imperative that any weight capacity ratings are not exceeded on the ball that is mounted on your tow vehicle, or the Shocker Hitch. V-19 rated. Do not exceed G.V.W.R. of ball being used.


  1. Take a vertical measurement from the bottom of the ball coupler tube to the bottom of the trailer frame sleeve. This dimension will be used to set the Shocker Gooseneck Surge Trailer Hitch
  2. Remove pins or loosen locking bolts on the trailer frame sleeve, and remove the existing coupler tube.
  3. Slide Gooseneck Surge Shocker Hitch insert tube inside the trailer frame sleeve with the air bag toward the rear of trailer.
  4. Hold or support Shocker at vertical measurement noted in Step #1. This should duplicate the previous ride height of the trailer. Shockerhitch must be properly aligned, (parallel with trailer), to maximize its benefits. Note: If your trailer coupler tube is equipped with a pin or pins, the correct pin location must be marked in the Shockerhitch insert tube and have a qualified machine shop drill / machine the pin holes.
  5. Torque locking bolts to your trailer manufacturers’ recommended specifications. A spacer kit is available for some applications.
  6. Lubricate: Oil the coupler shaft, grease coupling ball socket, and grease the hitch ball to REDUCE WEAR AND IMPROVE SHOCKER ACTION. Main pivot grease zerk should be greased periodically for maximum bushing life. ( Simply, you cannot over-grease it! )
  7. Hook up the trailer by simply lowering the coupler onto the ball. (Handle will snap open & shut automatically). To release trailer: Pull handle up and hold while raising trailer.
Flatbed Recessed Gooseneck Ball Fitment Guide
Flatbed Recessed Gooseneck Ball Fitment Guide

We’re here to help. Contact Us

Installation Issues

We want you to have the best possible towing experience with your product and proper installation is important. If you need help, we are here for you. Just give us a call at 701-707-2666 or use our contact us form. You can also look up the item’s product page on our website and view the installation tab. Most products on our website have a set-up guide and installation video.


Answers to Frequently Asked Questions on the Gooseneck Surge

How do I know the Gooseneck surge with fit my gooseneck trailer? There are two things you need to know. What kind of stem your gooseneck trailer has and what kind of ball your pickup has. You can also find the hitch you need by using our Gooseneck Trailer MFG guide.

What is the Gooseneck surge tow rating?  30,000 lbs towing capacity with Shift Lock coupler for 2-5/16″ ball  / 7,000 lbs tongue weight & 40,000 lbs towing capacity with 40K goose air with Shift Lock coupler for 3″ ball. With a 30k Shift Lock coupler its 30,000 lbs towing capacity & 7,000 lbs tongue weight.

How long will the airbag last? Our air spring bags are an industrial bag and will last for years and years. They are similar to truck airbags but have been beefed up internally for our towing applications.

Is there a way to lock the Gooseneck coupler? Yes, we do carry a gooseneck coupler lock specially made for our surge hitch as well as a stem set bolt lock. You can check those out here:

Can you really install the Gooseneck Surge in a couple of minutes? Yes check out the install video.

How much air do I put in the gooseneck surge air hitch?  See air pressure video.

What do your mean when you say straight or angled / slotted pin holes?  We are wondering if your gooseneck stem has holes that are straight across OR if it is slightly angled 10-30 degrees, where the stem hitch pin is off set or at an angle. Below is a picture of an angled stem, which we would use a stem with slotted holes to fit this angled pin. See our gooseneck stem selection guide.

Will it work with my flat bed pickup with recessed in a flatbed pocket? Yes, see install tab and fitment guide for recessed ball.

If I Order a gooseneck surge air hitch & coupler, what all comes in the box? Includes a complete replacement gooseneck stem, surge air hitch system & coupler along with clear-cut installation instructions.

How long will it hold air? This is a sealed air system that will hold air for weeks or months. If you haul the same trailer with the same load weight, it should be good for quite some time.

How strong is the center pivot bolt?  The main pivot bolt with grease zerk, or center pivot bolt, used on the gooseneck hitch, is a custom made 1 inch diameter 1045 medium carbon steel bolt. Strategically heat treated to prevent wear and includes a machined grease passage for easy lubrication and maintenance. It should be noted that the yield strength of the 1.25″ pivot bolt exceeds the rating of the gooseneck hitch.

How often do I grease it? The grease does not just lube the pivot; it also keeps water and dirt out. You cannot over grease it, once every few months should do it.

How does the air ride work? The air shocker is like a teeter totter. One end is an air bag, a pivot in the middle, and a ball at the other end. This gives a “pillow” effect at the ball end.

How much does an Shocker gooseneck surge weigh? The Gooseneck Surge Air Hitch & Coupler weighs 95 to 100 lbs depending on the model.


This product is back the Shocker Hitch Manufacturer Warranty and the Shocker Hitch Smooth Towing Guarantee. View our online Warranty Registration Form to register your Shocker Hitch.

Questions and answers of the customers

    I cannot get the hitch to line up straight with my diamond C trailer. The pin on the trailer is angled & the holes in the coupler is angled & slotted but not slotted enough to line up straight
  1. 0 votes
    Q I cannot get the hitch to line up straight with my diamond C trailer. The pin on the trailer is a...... Read more
    A Would you be able to send us pictures of the front, both sides of your stem and the existing coupler that you had on before your shockerhitch to - thank you.
  2. If my ball is recessed in my utility bed how much room do i need around it to clear and how high is the air bag below the top height of the ball
  3. 0 votes
    Q If my ball is recessed in my utility bed how much room do i need around it to clear and how high ...... Read more
    A The opening needs to be at least 12"x12" and the top of the ball can be no more than 2" from the top of the bed. The airbag sits 14" above where the ball would be.
  4. Is there a load indicator to visibly see how heavy the tongue is loaded?
  5. 0 votes
    Q Is there a load indicator to visibly see how heavy the tongue is loaded?
    A No there is not.
  6. if you have a compressor on the truck can you have a switch and gauge in cab to release and add air?
  7. 0 votes
    Q if you have a compressor on the truck can you have a switch and gauge in cab to release and add air?
    A I have heard of customers setting something up that way. We don't sell anything to do that, but I have heard of customers hooking that up.
  8. what is the max air pressure for the bag? I've seen people putting 50psi in them
  9. 0 votes
    Q what is the max air pressure for the bag? I've seen people putting 50psi in them
    A The maximum PSI is 100.

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3 reviews for Shocker Gooseneck Air Hitch & Coupler for Diamond C Trailers

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Customer Reviews

  1. I was unsure about how well this hitch would work for our gooseneck, I am so grateful that we decided to buy and highly recommend this to anyone and everyone! It smoothed out the ride and made towing a good experience. The customer service on the phone is exceptional and shipping was quick. This organization and product is beyond my expectation.

    – Katie
  2. Fantastic! This has clearly helped with the overall ride quality while pulling our trailer!!!

    – John Humphrey
  3. Workmanship is A Plus. Great Service

    – BoJac Farms Inc

Weight / Dimensions

Weight 100 lbs
Dimensions 34 × 22 × 10 in
Select Gooseneck Inner Stem Size & Pin Type

3-15/16"RND AnglePin, 3-15/16"SQ TopCrank, 4.5"SQ, 4"RND AnglePin, 4"SQ TopCrank

Select ShiftLock Gooseneck Coupler

2-5/16"Ball Coupler, 2-5/16"Ball9"OffsetCoupler, 3" Ball Coupler

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