Shocker Gooseneck Surge Air Hitch & KingPin
Rated for your tow
30,000 lbs GTW · 7,000 lbs TW· 30,000 lbs GTW · 7,000 lbs TW
$2,284.78
$2,627.50 save $342.72
Easy Install
Completely replaces your factory gooseneck stem & coupler with Gooseneck Surge Air System with King Pin. Installs in Minutes.
Fits Low Profile 5th Wheel Plates
& has 3 height adjustment holes. (Standard King Pin extends 3" forward from your factory King Pin)
Gooseneck Air Hitch to King Pin
Designed for low-profile 5th wheel plates like on flatbed trucks. Not for use with camper 5th wheel plate.
30,000 lbs Tow & 7,000 lbs tongue weight
With the ability to adjust air pressure for the best ride and load control. Heavy loads, just add air.
Stop destroying your trailer and cargo.
Every bump, pothole, and expansion joint sends a violent jolt through your trailer frame, damaging cargo and wearing out your truck. Shocker Air Ride Hitches absorb that punishment at the coupling, before it reaches your trailer.
The Surge Air Gooseneck Kingpin Conversion 30K converts your gooseneck trailer to ride on a low-profile commercial 5th-wheel plate. Instead of a ball coupler, the square-4-5-inch carries a King Pin kingpin socket that drops onto the 5th-wheel jaws of a flatbed truck or semi. Rated 30,000 lbs GTW with 7,000 lbs tongue weight. Critical: this is for low-profile commercial plates only — not for camper or RV 5th-wheel hitches.
Key Highlights
- 30,000 lbs GTW / 7,000 lb tongue weight rating
- King Pin replaces the ball coupler — kingpin socket geometry
- Designed for low-profile commercial 5th-wheel plates (flatbed trucks, semis)
- NOT for camper or RV 5th-wheel hitches — wrong height and geometry
- Same patented forward-back surge air absorption as the Standard 30K
- square-4-5-inch replaces factory inner stem in minutes
- 3 height adjustment holes; extends 3" forward of factory location
- Made in Jamestown, ND by Shocker Hitch USA
Gooseneck Trailer, 5th-Wheel Truck
This conversion exists for one specific operator: someone with a gooseneck trailer (with a square or round inner stem) who tows with a flatbed truck or semi that already has a low-profile commercial 5th-wheel plate installed. Instead of welding a gooseneck ball to your flatbed, you swap your trailer's inner stem for the Shocker square-4-5-inch with a King Pin socket. Your gooseneck trailer now drops onto the same 5th-wheel jaws used by semi trailers — with Shocker air ride absorbing the forward-back jerk that flatbed and semi suspensions can't filter.
Read This Before Ordering — Plate Compatibility
This kingpin conversion is engineered for LOW-PROFILE COMMERCIAL 5th-wheel plates only. These are the flat steel plates with sliding jaws you see on flatbed trucks and semi tractors. It is explicitly NOT compatible with camper-style or RV 5th-wheel hitches (Reese, B&W, Curt, Andersen, etc.) — those sit higher off the truck bed and use different geometry. If your truck has a tall RV-style 5th-wheel hitch in the bed for towing a fifth wheel camper, this is the wrong product. For RV 5th-wheel users, see the Quick Air Gooseneck or 5th-wheel air-ride conversion families instead.
Air Ride for Mixed Gooseneck and 5th-Wheel Operations
King Pin Replaces Ball Coupler
The factory ball coupler is removed entirely and replaced with a forged kingpin socket sized to engage standard commercial 5th-wheel jaws.
Forward-Back Airbag
Same patented surge-air mechanism as the Standard 30K — the air spring sits between the inner stem and the kingpin, absorbing the forward-back jerk amplified by stiff commercial truck suspensions.
30,000 lb Capacity
Engineered to the same 30,000 lbs GTW as the standard ball-coupler 30K, with a 7,000 lb tongue weight rating suitable for commercial flatbed loads.
Drops Into Trailer Outer Tube
The square-4-5-inch replaces the factory inner stem in your gooseneck trailer's outer tube. No truck-side modification — your existing 5th-wheel plate stays as-is.
Built for Commercial Flatbed and Semi Operators
This is a niche product designed for one specific use case.
- Flatbed truck operators with low-profile 5th-wheel plates
- Semi tractor owners who also need to pull gooseneck equipment trailers
- Hotshot haulers running mixed gooseneck and 5th-wheel fleets
- Commercial drivers who want one truck to pull both trailer types
- Industrial transporters with low-profile commercial fifth wheels
Stem Options
Same chassis, same King Pin, three inner stem shapes to match your trailer.
Multi-Fit Round (4" or 100mm)
Patent-pending round stem fits both 4" and 100mm round outer tubes with straight or angled pin holes.
Multi-Fit Square (4" or 100mm)
Fits both 4" and 100mm square inner tubes with straight pin holes — the most common modern square stem.
4-1/2" Square Stem
Heavy-wall stem for trailers using the larger 4-1/2" square inner tube, common on heavy-duty manufacturers.
What's Included
- Shocker Gooseneck Surge Air Hitch assembly with built-in air ride and dual bump cushions
- square-4-5-inch replacement inner tube stem
- King Pin kingpin socket assembly
- Schrader air valve
- Installation instructions
Not Included
- —5th-wheel plate (must already be installed on the truck)
- —Air compressor or pressure gauge (sold separately)
- —Ball coupler (this product replaces it; not a dual-purpose part)
Installation
Confirm your 5th-wheel plate is the low-profile commercial type (NOT a camper RV hitch). Unhook the trailer and raise the gooseneck on its jack. Pull safety pins from your factory inner stem and slide it out of the outer tube. Slide the Shocker square-4-5-inch with kingpin socket into the outer tube, align the height holes, re-pin. Inflate the airbag to starting pressure. Position over the 5th-wheel jaws and engage as you would any kingpin trailer.
Tools needed:
Socket wrench set · Hex key set · Floor jack or two-person lift
$2,284.78
Still researching?
Skip the product wall — these are the four guides every buyer actually opens before they decide.
Installation Guide
Step-by-step videos for every Shocker family. What's in the box, what tools you need, and how long it takes.
Watch the installAir Pressure Setup
How to dial in air pressure by trailer weight so the ride is right the first time and the hitch lasts longer.
See psi by loadTowing Capacity Guide
Match GTW, tongue weight, and receiver size to your truck class so you don't over- or under-buy.
Read the guideConfigure Your Hitch
60-second fit quiz — answer a few questions about your truck and trailer, get a tailored recommendation.
Start the quiz
- 1-Year Manufacturer Warranty
- 60-Day Returns
- 20,000+ Customers
- Ships from Canada