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
$1,411.18
$1,543.90 save $132.72
or as low as $118/mo with flexible financing — 4, 6, or 12 months. Options at checkout.
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.
Pull a heavy trailer over frost heaves and hard stops and you feel every jolt run straight up the tongue, into your cargo, and back into the truck. The Shocker Heavy Duty 25K Air Tongue Mount takes that hit for you. It bolts right onto your trailer A-frame and puts the air ride on the trailer instead of the truck, so any tow vehicle that hooks up gets a smoother tow. It handles up to 21,000 lbs GTW with 2,100 lbs of tongue weight, which is real breathing room when the load rides heavy up front. Order it as a bare base frame or with a coupler already installed. The built-in 3-inch front channel takes a vertical-channel coupler or a pintle ring.
Key Highlights
- Handles up to 21,000 lbs GTW and 2,100 lbs of tongue weight, the heaviest tongue-mount tier we build
- Built-in 20K air ride soaks up road shock right at the trailer connection, before it reaches your cargo
- Square Plate Mount bolts straight onto heavy factory-built A-frame trailers
- Buy it bare or with the coupler already installed and ready to tow
- 3-inch front channel takes your choice of ball coupler or pintle ring
- Plays nice with weight-distribution hitch systems
- The air ride travels with the trailer, so every truck that hooks up rides better automatically
- In stock in Canada and ships direct, so no waiting at the border
What's Included
- Shocker HD 25K Air Trailer Tongue Mount base frame (Square Plate 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 (sold separately on no-coupler SKUs)
- —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
Watch the official install walkthrough for this hitch — the exact steps and tools, straight from the manufacturer.
How It Works
The Air Bag Takes the Hit
A 20K-rated air bag sits between the coupler and the trailer A-frame. It catches the road shock and cushions it before it can reach your trailer frame, your cargo, or your truck.
Dial It In for Your Load
Add air when the trailer runs heavy and let some out when it is light or empty. A few pumps sets the right pressure so the ride stays smooth whether you are loaded up or running bare.
Simple Rocker Arm, Fewer Parts
The coupler pivots down and back on a rocker arm, with no slides, rollers, or parallel linkages to wear out. Fewer moving parts means less to maintain and a longer working life.
Keeps Your Ground Clearance
The air ride mounts above the trailer tongue instead of hanging below it, so you keep full ground clearance for steep approaches, off-road equipment trailers, and tilt-deck haulers.
Built for Your Heaviest Trailers
The 25K rating puts this at the top of the tongue-mount range, made 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 Ways It Bolts On
Pick the version that matches how your trailer A-frame is built:
Vertical Channel Mount (SH-HD4000 series)
Fits a 3-1/2-inch wide vertical channel with a 2-inch center-on-center bolt pattern. Pin or bolt it in place with 5/8-inch hardware (4-1/2 inches long is what we recommend). This is the common setup on shop-fabricated trailer A-frames.
Square Plate Mount, 4-Bolt (SH-HD4500 series)
Uses a 4-1/2-inch square bolt pattern and bolts straight to a flat plate on the trailer tongue. Four bolts and you are done. You see this a lot on factory-built dump and equipment trailers.
Bring Your Own Coupler, or Buy It Bundled
Order the HD 25K as a bare base frame or with a coupler already installed. The 3-inch front channel takes any vertical-channel-mount ball coupler or pintle ring rated up to 25,000 lbs. Popular pairings are the Demco EZ-Latch (DEM-14040-81) at 21K, the Wallace Forge auto-locking coupler at 20K or 25K, and the Shocker SH-P20000-B pintle ring at 20K. One thing to keep in mind: your total tow rating is only as high as the lowest-rated piece in the chain, so match the coupler to your trailer GTW.
Why Mount the Air Ride on the Trailer?
Put the air ride on the trailer instead of the truck and every vehicle that hooks up gets the benefit, with nothing to swap between trucks. That is a big deal for fleet trailers that see different drivers, rental trailers, equipment trailers shared between operators, and any commercial job where the trailer stays the same but the truck changes. The HD 25K is the heaviest tongue mount we make, built for end-dump operators, race haulers, equipment fleets, and anyone whose trailer matters more than which truck is pulling it that day. Every one is backed by the Shocker Hitch 60-day satisfaction guarantee.
$1,411.18
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
