Why would I upgrade my fifth wheel pin box?

Upgraded pin boxes reduce chucking (that jarring back-and-forth motion), soften the ride over bumps, reduce noise, and can even help with short-bed clearance (rotational models). If you experience uncomfortable chucking or want a smoother towing experience, a pin box upgrade is one of the most effective improvements you can make.

What is an air-ride pin box?

An air-ride pin box uses air bags or pneumatic cushioning between the pin box and the trailer frame to absorb road shock and reduce chucking. Lippert (sold under the CURT name as the Air Ride and Flex Air) and Shocker (Quick Air) make air-ride pin boxes; MORryde's popular pin box uses a rubber spring instead of air. They significantly smooth out the ride quality, especially on rough roads, and reduce the impact felt inside both the truck and trailer.

How much does a pin box upgrade cost?

Roughly $800 to $2,100 for the pin box itself, depending on the type. Rubber-cushioned boxes like MORryde's run about $800-$900, rotational boxes like the Reese Sidewinder start around $900, and air-ride boxes run about $1,300-$2,100 (Shocker Quick Air, Lippert/CURT Air Ride and Flex Air). They are heavy, so budget for shipping, plus labor if a shop installs it.

Does a pin box upgrade reduce chucking?

Yes, reducing chucking is the primary benefit of most pin box upgrades. Cushioned and air-ride pin boxes absorb the back-and-forth forces that cause chucking. Even a basic cushioned pin box can dramatically reduce chucking compared to a rigid factory pin box. For severe chucking, air-ride models provide the most improvement.

Pin Box Upgrades

Q: What is a pin box on a fifth wheel trailer?

The pin box is the steel housing on the front of your fifth wheel trailer that contains the kingpin. It connects the trailer to the hitch in your truck bed. The standard pin box that comes with most trailers is a simple steel box. Upgraded pin boxes add cushioning, air suspension, or rotation to improve the towing experience.

Q: Can I install a pin box upgrade myself?

Yes, most pin box upgrades are a DIY-friendly job. You'll need a jack to support the trailer, basic hand tools, and typically 2-4 hours. The process involves supporting the trailer, removing the old pin box bolts, swapping in the new unit, and re-torquing everything. Having a helper makes it easier since pin boxes are heavy.

Written by a towing industry expert Updated October 2026

The short answer: An upgraded pin box can make a huge difference in ride quality. Here's when it's worth the money.

What Is a Pin Box on a Fifth Wheel Trailer?

The pin box is the part of your fifth wheel trailer that houses the kingpin — the pin your hitch's jaws lock around. It's mounted to the front of your trailer's frame.

Stock pin boxes are basic. Upgraded pin boxes add cushioning, rotation, or other features to improve the towing experience.

Why Upgrade Your Pin Box?

Three main reasons

1. Fix Chucking/Bucking

That jarring back-and-forth motion on rough roads? An air-ride or cushioned pin box absorbs it before it reaches your truck. This is the #1 reason people upgrade.

2. Short Bed Solution

Rotational pin boxes move the trailer's turning point back behind the kingpin, which buys back cab clearance on a short bed — a Reese Sidewinder can clear more than a typical slider. The catch is cost: you pair it with a fixed hitch, and the two together usually cost more than a slider. Short Bed Towing compares the options.

3. Quieter Ride

Upgraded pin boxes reduce the clunking and popping noises that come from the trailer's front end.

What Types of Pin Box Upgrades Are Available?

Air-Ride Pin Boxes

Best for Chucking

Uses air bags or air springs to cushion the connection. The most effective at eliminating chucking and improving ride quality.

Popular brands:

Lippert/CURT, Shocker

Price range:

$1,300 - $2,100

Rotational/Articulating Pin Boxes

Best for Short Beds

A wedge locks the kingpin in your hitch and the trailer pivots at the back of the pin box instead, further from your cab. Buys back clearance on a short bed — Reese says the Sidewinder moves the pivot back up to 22", more than most sliders travel — but a fixed hitch plus the pin box usually costs more than a slider, you're maintaining both, and the wedge has to suit your hitch.

Popular brands:

Reese Sidewinder (formerly Revolution), Lippert Turning Point

Price range:

From about $900

Cushioned/Dampened Pin Boxes

Budget-Friendly

Uses rubber or polymer cushions instead of air. Less effective than air-ride but more affordable. A good middle ground.

Popular brands:

MORryde (rubber spring)

Price range:

About $800 - $900

Gooseneck Conversion Pin Boxes

Frees Up Your Bed

A different animal from the three above: instead of keeping your kingpin, these replace the pin box with a gooseneck coupler, so the trailer tows off a ball in the bed and no fifth wheel hitch is needed at all. They still build in shock absorption — air, coil, rubber torsion or rubber shear depending on brand.

Brands:

Reese Goose Box, CURT Helux, Gen-Y Executive Torsion-Flex, MORryde GooseTech, B&W, Shocker

Price range:

$1,300 - $2,100, plus a gooseneck hitch in the truck

Full breakdown: Gooseneck Pin Box Comparison · Deciding whether to convert at all: Pin Box vs Fifth Wheel Hitch

Can I Install a Pin Box Upgrade Myself?

What's involved

Pin box upgrades require removing your trailer's existing pin box and installing the new one. It's a significant job but doable for experienced DIYers.