Arrives before Christmas 
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.
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.
California residents: click here
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 5th wheel pin box with a gooseneck coupler. That means an easy connection to your 2 5/16 inch gooseneck ball and then a clear truck bed when it's time to haul tools, bikes, or camping gear. This upgraded coupler features a built-in coil spring, as you can see right here.
And so that's going to help smooth out bumps and cuts down on that annoying back and forth motion, also known as chucking. So this coupler is going to bolt directly to your Lippert Rhino pattern with the included hardware that you see here on my table. And this has been approved for use on Lippert RV frames, so you're not gonna have to risk your warranty. Now, I do wanna mention that whereas the installation is gonna be pretty simple, this is very heavy. I needed two other guys to help me get this on my table with me.
So just be aware that this is heavy, very robust product. So you do wanna make sure that you have the support that you need to lift this into place. Now, this does have a towing capacity of 20,000 pounds and a pin weight range from 1,800 to 3,200 pounds. So you wanna make sure that you're within that pin weight range to get the maximum effectiveness of this unit. And we do have instructions on this product page that you can follow so that you can accurately measure your pin weight.
So if you are wondering how to do that, do take a look at this product page for those step-by-step instructions. Now, the coil spring and shock system is going to work together to help cushion road vibrations and it's gonna help absorb those jolts that come from potholes, bridge joints and dips. This is going to be a big upgrade from those rigid couplers and it's gonna give you a smoother, more relaxed towing experience. And unlike air systems that need regular pressure checks and occasional repairs, this coil spring system is gonna be ready whenever you are. So no air bladders to worry about, no valves, just reliable performance every trip.
This does feature an auto-latching coupler that's gonna make hitching quick and stress-free. You're just gonna back up, line up, and then this coupler's gonna lock automatically on that 2 5/16 inch ball. And then when you're ready to uncouple or disconnect, we do have this cable here that you can use outside of the bed of your truck. You're just going to pull that and then that's going to allow you to disconnect from that ball. So easy to connect and just as easy to disconnect. This is constructed of carbon steel with a slightly textured black powder coat finish. So this is gonna hold up really well for you. And I'm sure you also notice safety chains are included, which is an added bonus. I do wanna point out that this is not gonna be compatible with CURT rocker ball cushion hitch gooseneck balls, just so you're aware of that. But if you do happen to have any other questions, whether it's about this adapter or anything else that we carry here at etrailer, don't hesitate to reach out. We do wanna make sure that you're getting exactly what you need. Well, again, my name is Andy, thank you for joining me.
Easy to install. Works great. There is a noticeable reduction in chunking.
Glad the pin box was good. The box and pallet were damaged badly. Will be installing it tomorrow. I think it will enhance our ride while towing.
I received this curt helux pin box very quickly. I was impressed with how fast and how the shipment was handled. I've installed the pin box but haven't yet towed our 5th wheel yet. 1st camping trip later this month possibly. Maine weather needs to be a bit nicer. Anyway. So far very impressed with the product.
This pin box is absolutely amazing. Way smoother pull way less chucking ! Highly recommended this over any stock pin box.
I’ve only had my toy hauler out one since installing the hitch but went over a set of RR tracks and 3 bridges and it definitely makes a difference. Greatly soften the blows to the truck so you know it’s taking a lot of stress off the fifth wheel. Watched it workings through the rear view mirror. Simple design that someone should have come up with long ago. Took a friend of mine and I exactly 1 hour to install withe the help of his motorcycle jack on the tailgate of the truck. It’s heavy and well built. They are a little pricey but I feel well worth it for the longevity of the frame. Most importantly know the weight of your trailer loaded to pick the right one
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