Will The Curt Helux Pin Box Fit On A Grand Design Solitude 376RD 5th Wheel

Updated 02/24/2025 | Published 02/17/2025

Question:

Will this pin box work on a Grand Design 376RD fifth wheel with a MorRyde pin box from the factory?

asked by: Dave L

Expert Reply:

Hey Dave,

The Curt Helux is still in production and not yet available so I can't 100% confirm it will have a compatible mounting pattern, but it's highly likely that it will. In order to determine what your pattern is you'll need to look for a white sticker that lists the RPO #, serial #, and LCI item #. This sticker is typically on the driver's side of the pin box and with these numbers we can look up the bolt pattern. MORyde will also some times have a code on the front of their pin boxes which can be used to determine the bolt pattern.

If you can let me know what you find I can confirm the pattern and when the Helux is available we can check for a matching fit.

expert reply by: Kevin C

Pin Box ID Sticker
(click to enlarge)

Dave L.

2/22/2025

Thanks, Kevin. S/N. S011399883 RPO. 0011715415 LCI. 573FS442XRAA18287

Kevin C.

2/24/2025

@DaveL Based on the those numbers you have a Rhino Box bolt pattern. The Helux looks like it's a Rhino with the added coil spring and shock so I'd say it's likely that they will make a version that can be used to replace a Rhino Box.