MORryde GooseTech For A 2021 Grand Design 337RLS

Updated 12/08/2025 | Published 11/20/2025

Question:

I have a customer with a 2021 Grand Design 337RLS. WHICH Moryde Goosetech hitch would you recommend for this 5th wheel?

asked by: Michael W

Expert Reply:

Hi Michael!

Everything I am finding is saying your 2021 Grand Design 337RLS has a 1621 pin box, but I would still contact Grand Design with your VIN to confirm that. If it is what you have, it makes it nice and easy to get you the correct one. If you end up having a different pin box number, just let me know and I can find one that will fit what you have properly.

For that 1621, you will want the MORryde GooseTech 5th Wheel to Gooseneck Pin Box - Lippert 1621 - 14K to 18K GTW # MR97MV you were looking at. Your unloaded weight looked to be 10,697 pounds and you had a carrying capacity of 3,298 pounds, putting you at 13,995 pounds. Being that close to 14K, I am perfectly comfortable recommending this pin box for your rig.

Are getting ready for a trip or for next season? If it's a trip, where you headed? I have a lot of Russian ancestry and prefer to be out in the mountains when it's nice and cold. ^___^

expert reply by: Lazer S

Lazer S.

12/8/2025

Hey Michael, how did things go with the MORryde GooseTech pin box for your Grand Design 337RLS? Did it end up being the right fit after confirming your pin box number with Grand Design? Your update could make it easier for the next person with the same setup.