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Start towing your fifth wheel with a gooseneck ball without losing comfort. A built-in coil spring smooths out bumps and cuts down on chucking. And with the bed cleared, your truck stays useful for gear or daily driving when you're not towing.
Switching from a fifth wheel pin box to a gooseneck coupler isn't just about changing the connection. With this setup you get the benefits of a gooseneck (a clear truck bed when you're not towing and a simple ball connection when you are) while also gaining a smoother ride. The coil spring softens the bumps you get with a rigid coupler. Plus, it'll take the edge off when you cross bridge joints and dips that usually set off back-and-forth chucking.
This pin box bolts directly to the Lippert Rhino pattern with included hardware and it's approved for Lippert frames, so you can install it without worrying about your warranty. It's heavy enough that you and a friend should handle the lift, and following the torque specs is key to getting it set correctly. If an extra set of hands isn't available or you're not comfortable doing this yourself, we can help you find a trusted shop to install it for you.
The auto-latching coupler drops onto your 2-5/16" ball. But, the cool part is that it'll lock in on its own. You just back in, line up, and it clicks into place. That saves time when you're getting ready to head out of the driveway. When you're ready to unhitch, the release is just as simple.
One of the frustrations with air-ride systems is checking the pressure or having to top things off. Or even worse, trying to find a leak. The coil spring design avoids all of that. There are no bladders to inflate and no valves to fail. It'll stay ready between trips, so you can just hitch up without adding more things to your checklist.
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.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi, everybody, Andy here with etrailer. Let's take a quick look at this CURT Helux 5th Wheel to Gooseneck Shock-Absorbing Pin Box Adapter Now, this setup is going to replace your traditional fifth wheel pin box with a gooseneck coupler. That means an easy connection to your 2-5/16-inch gooseneck ball and a clear truck bed when it's time to haul tools, bikes, or other camping gear. Now, this upgraded coupler features this built-in coil spring that's going to smooth out bumps and cut down on that annoying back and forth chucking. So, this coupler is going to bolt directly to your Lippert Rhino pattern with the included hardware that you see here at the bottom of my table, and this is going to be approved on your Lippert RV frames, so you're not going to risk your warranty. Now, this does have a towing capacity of 20,000 pounds and a pin weight range from 1,550 pounds up to 2,700 pounds.
Now, on this product page, we do have steps that you can take to accurately measure your pin weight. So, if you're looking to figure out how to measure your pin weight, do take a look at those instructions on this product page. Now, the coil spring and shock system is going to help cushion road vibrations and help absorb those jolts from the potholes, bridge joints, and dips. And this is a big upgrade from those rigid couplers and it gives you a smoother, more relaxed towing experience. And unlike air ride system that need regular pressure checks and occasional repairs, this coil spring system is going to be ready whenever you are.
No air bladders, no valves to worry about, just reliable performance every trip. The auto-latching mechanism on this coupler here is going to make hitching quick and stress-free. You're just going to back in, line it up, and then it's going to lock automatically on that 2-5/16-inch ball. And then when it's time to disconnect, you're just going to release it with this cable. It's gonna be very simple.
Obviously, because of the weight of this unit, I'm unable to demonstrate the coupling mechanism on my table here. But when you're ready to release, we do have this cable here that you'll just pull, and then that will disconnect it from the ball. So, very easy to use. This is constructed of carbon steel with a slightly textured black powder coat finish, so I think it's gonna hold up really well for you. Again, the hardware is gonna be included to get this mounted into place.
We do have a grease zerk here as well. And then you're gonna get towing chains with this. So, you see the one here on this side, and then we got the towing chain on the other side as well. I do wanna mention that this is not going to be compatible with CURT RockerBall cushion hitch gooseneck balls, just so you're aware of that. But if you happen to have any other questions, whether it's about this or anything else that we carry here at etrailer, don't hesitate to reach out to us 'cause ultimately, we wanna make sure that you're getting exactly what you need. Well, again, my name is Andy. Thank you for joining me.
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?
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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?