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Tired of your trailer tossing you around? Curt's Helux pin box smooths things out with a tough coil spring that beats air bags and torsion setups. It's maintenance-free, easy to use, and won't put your RV's frame warranty at risk.
The Helux coil spring system absorbs road shock, jerking, and the back-and-forth chucking that wears you out on long drives. It keeps things steady through starts, stops, and uneven roads so your ride feels calmer, your cargo stays safer, and your trailer takes less of a beating.
Built from fully welded steel with a triple-layer powder coat, this pin box is made to handle years of towing and all kinds of weather. And with no airbags, bearings, or bushings to service, you won't have to think about upkeep.
Unlike some aftermarket pin boxes, this one is approved for use on Lippert RV frames. That means you get a smoother ride without risking your trailer's warranty.
Notes:
Your trailer's pin weight is the amount of weight pressing down on your truck through the king pin. It's the key factor in choosing the right Curt Helux pin box since each model is tuned to a specific pin-weight range. If it's too light, the coil springs won't engage correctly, but if it's too heavy, you'll overstress the system. When this number is accurate, the pin box performs the way it was designed and gives you the smoothest ride possible.
The most reliable method is to use a set of certified vehicle scales (like CAT scales).
This process accounts for how your trailer is actually loaded, which includes cargo and water tanks, so you know you're picking a pin box that matches the conditions you're using it with.
If you don't have access to a scale, you can get a ballpark figure with your trailer's GVWR:
This method gives you a starting point, but remember it's only an estimate. The actual pin weight can change depending on how you fill tanks and distribute weight in the trailer.
Ratings & Reviews
Christopher H.
9/17/2026
Let us know how the install goes Jim! Happy Joanne was able get you taken care of.
Lazer S.
11/25/2025
Glad to hear you are happy with it, Russell! These Helux pin boxes are still fairly new to market, so are always happy to hear real world feedback, so thanks for that! ^___^ What kind of 5th wheel did you install this on?
Kate F.
7/13/2026
Thanks for taking the time to leave a review. I'm glad to hear the Helux is taking the harshness out of the bigger bumps, although I'm sorry to hear the chucking has gotten worse. The first is making sure the trailer is towing as level as possible, since a nose-high or nose-low attitude can make chucking much more noticeable. It's also a good idea to verify your trailer's loaded pin weight. If it's significantly lighter or heavier than expected, it can affect how the suspension in the pin box performs. Finally, take a look at your hitch height and make sure everything is torqued to the installation specifications, as any movement in the hitch or mounting hardware can add to the sensation of chucking. What pin box did you replace?
Do you have a question about this 5th Wheel Pin Box?
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Kate F.
9/14/2026
Thanks for the great review, Ryan! Going from the standard Rhino to the Curt Helix sounds like a really nice upgrade. Glad to hear the install was straightforward and you’re impressed with the quality. Thanks for the pictures too! Where did you go for the first big adventure with the new pin box?