HD Air Trailer Tongue Mount & Demco Coupler for 2-5/16" Ball - 21,000 lbs
Rated for your tow
21,000 lbs GTW · 2,100 lbs TW· 21,000 lbs GTW · 2,100 lbs TW
$1,510.30
$1,736.84 save $226.55
Air ride technology
Built-in air ride system for a smoother towing experience with built in height adjustment plus weight adjustable.
Quickly mounts to trailer tongue
Choose from vertical channel mount (fits 3-1/2″ wide vertical channel with 2″ center on center bolt pattern & secure with 5/8" pins or bolts) or square plate 4 bolt mount (4-1/2" square bolt pattern)
Smoother safer towing. Improves your
ride, reduces wear & tear on pickup & trailer
20,000 lb rated towing capacity
with a cast 2 5/16" heavy duty demco coupler
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 Shocker Heavy Duty 25K Air Tongue Mount is the flagship trailer-side air ride hitch. Bolts directly to your trailer A-frame, putting air ride on the trailer instead of the truck — so any tow vehicle gets a smoother tow. Rated up to 21,000 lbs GTW with 2,100 lbs tongue weight. Sold as a base frame OR with a pre-installed coupler. Built-in 3-inch front channel accepts a vertical-channel coupler or pintle ring.
Key Highlights
- Up to 21,000 lbs GTW with up to 2,100 lbs tongue weight — heaviest tongue-mount tier
- Built-in 20K air ride system absorbs road shock at the trailer connection
- Vertical Channel Mount for direct fit on heavy A-frame trailers
- Available as base frame, or pre-paired with coupler
- 3-inch front channel accepts ball couplers or pintle rings
- Works with weight-distribution hitch systems
- Air goes with the trailer — every tow vehicle benefits automatically
- Made in Jamestown, North Dakota
How It Works
Air Ride Suspension
A built-in 20K-rated air bag sits between the coupler and the trailer A-frame, absorbing road shock before it reaches your trailer frame, cargo, and tow vehicle.
Adjustable for Any Load
Add or release air to fine-tune the ride for your trailer weight. Heavier load? More air. Light or empty trailer? Less air. Dial in the perfect pressure every time.
Rocker Arm Pivot Design
The coupler pivots down and back on a rocker arm — no slides, rollers, or parallel linkages. Fewer moving parts means less maintenance and longer life.
Maximum Ground Clearance
The air ride system mounts above the trailer tongue, keeping ground clearance at a maximum for steep approaches, off-road equipment trailers, and tilt-deck haulers.
Ideal For These Heavy Trailers
The 25K rating positions this as the heaviest tongue-mount tier — designed for serious commercial and recreational haulers:
- End dump trailers and heavy equipment trailers
- Race car haulers and stacker trailers
- Skid steer and tilt-deck equipment trailers
- HD flatbed trailers and lowboys (within rating)
- Large enclosed cargo and tool trailers
- Any A-frame trailer up to 21,000 lbs GTW with up to 2,100 lbs tongue weight
Two Mounting Geometries
Choose the variant that matches your trailer A-frame configuration:
Vertical Channel Mount (SH-HD4000 series)
Fits 3-1/2-inch wide vertical channel with 2-inch center-on-center bolt pattern. Secure with 5/8-inch pins or bolts (4-1/2 inches long recommended). Most common configuration for fabricated trailer A-frames.
Square Plate Mount, 4-Bolt (SH-HD4500 series)
4-1/2-inch square bolt pattern. Bolts directly to a flat plate on the trailer tongue. Simple 4-bolt installation. Common on factory-built dump and equipment trailers.
Bring Your Own Coupler — Or Buy It Bundled
The HD 25K is sold as a base frame OR with a pre-installed coupler. The 3-inch front channel accepts any vertical-channel-mount ball coupler or pintle ring rated up to 25,000 lbs. Recommended bundles: Demco EZ-Latch (DEM-14040-81) at 21K, Wallace Forge auto-locking at 20K or 25K, or Shocker SH-P20000-B pintle ring at 20K. Note: total tow rating is limited by the lowest-rated component in the chain — match your coupler to your trailer GTW.
Why Mount the Air Ride on the Trailer?
When the air ride lives on the trailer instead of the truck, every tow vehicle that hooks up benefits automatically. This matters most for fleet trailers pulled by different drivers, rental trailers, equipment trailers shared between operators, and any commercial setup where the trailer is the constant. The HD 25K is the heaviest tongue mount we make — designed for end-dump operators, race haulers, equipment fleets, and anyone whose trailer matters more than which truck pulls it. Backed by the Shocker Hitch lifetime frame warranty.
What's Included
- Shocker HD 25K Air Trailer Tongue Mount base frame (Vertical Channel Mount)
- coupler (pre-installed on bundled SKUs only)
- Air bag (pre-installed)
- Schrader air valve with cap
- Greasable 1-inch heat-treated 1045 steel center pivot bolt
- Installation instructions
Not Included
- —Coupler or pintle ring (on no-coupler SKUs — sold separately)
- —Mounting bolts (5/8-inch bolts 4-1/2 inches long for vertical channel; 5/8-inch by 4-inch typical for square plate)
- —Air compressor or pressure gauge (available separately)
- —Weld-on vertical tongue adapter (available separately as SH-410-Spot or SH-410-C)
- —Weight-distribution hitch system (compatible but sold separately)
Installation
Remove existing coupler from trailer A-frame. Bolt the Shocker HD 25K Tongue Mount in its place using the appropriate Vertical Channel Mount bolt pattern. If your trailer doesn't have a vertical channel, weld on the optional SH-410-C adapter first. Bolt your coupler or pintle ring onto the 3-inch front channel. Connect air valve. Inflate to desired pressure.
Tools needed:
Socket wrench set · 5/8-inch bolts or pins (4-1/2 inches long for vertical channel mount) · Tire-style air pump for initial inflation
$1,510.30
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
