Which MORryde Pin Box Works with a Curt A16 Hitch on My 2018 Grand Design Reflection 337RLS?

Updated 08/04/2026 | Published 07/22/2026

Products Featured in This Question

MORryde Cushioned 5th Wheel Pin Box for 11.5K to 14K Trailers w/ Lippert 1621 and 1621HD

(297)

$799.99

Curt A16 5th Wheel Trailer Hitch - Dual Jaw - 16,000 lbs

(217)

$736.95

Question:

I am considering purchasing the Moreyde pin box for my 2018 Grand Design 337RLS. My current pinbox is a 1621HD. My question is, I use a Curt A16 hitch with the floating head. Which pin box is compatible? Any help is greatly appreciated.

asked by: Gary D

Expert Reply:

Hello Gary,

Thanks for writing in!

Since your 2018 Grand Design Reflection 337RLS has the Lippert 1621HD pin box and a GVWR of 13,995 lbs, the MORryde Cushioned 5th Wheel Pin Box for 11.5K to 14K Trailers w/ Lippert 1621 and 1621HD # MR74VR is exactly what you need. It is designed to replace your factory 1621HD pin box and is the correct fit and weight range for your trailer.

The good news is your Curt A16 (like # C16120) hitch with the floating head is fully compatible with the # MR74VR. The MORryde uses a standard king pin, so it will couple to your Curt hitch just like your factory pin box. The rubber shear spring in the MORryde does an excellent job of absorbing road shock and reducing chucking, while the floating head on your A16 allows the hitch to pivot naturally. Together, they make for a much smoother towing experience.

Are you looking to cut down on chucking, smooth out rough roads, or both?