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. ^___^
Product Page this Question was Asked From
MORryde GooseTech 5th Wheel to Gooseneck Pin Box for 14K to 18K Trailers w/ Lippert 1621
- 5th Wheel Gooseneck Adapter
- Adapts Trailer
- 5th Wheel Trailer to Gooseneck Hitch
- No Extra Clearance
- 24000 lbs
- Replaces Pin Box
- Shock Absorbing
- Lippert 1621
- MORryde
more information >
Continue Researching
- Search Results: bak industries tonneau cover
- Search Results: goosetech
- Shop: Safety Chain for MORryde Goosetech with Clevis Hooks - 87" Long - 26,000 lbs
- Shop: MORryde GooseTech 5th Wheel to Gooseneck Pin Box for 14K to 18K Trailers w/ Lippert 1621
- Shop: MORryde GooseTech 5th Wheel to Gooseneck Pin Box for 14K to 18K Trailers w/ Lippert Rhino
- Shop: MORryde GooseTech 5th Wheel to Gooseneck Pin Box for 14K to 18K Trailers w/ Lippert 1116
- Shop: Safety Chain with 2 Hooks for Gen-Y 5th Wheel to Gooseneck Pin Box - 84" Long - 26,000 lbs
- Shop: Tonneau Cover
- Shop: BAKFlip MX4 Hard Tonneau Cover - Folding - Aluminum - Matte Finish
- Shop: Buyers Products 3/8" x 42" Class 4 Trailer Safety Chain with 1 Clevis Hook - 43 Proof
- Search Results: trailer hitch
- Shop: Trailer Hitch
- Q&A: What Is An OEM Prep Package And How Do I Know If I Have It
- Article: Trailer Wiring Diagrams
- Video: Firestone Ride-Rite Air Bags with Easy Mount Compressor Feature Breakdown
- Shop: Trailer Wiring
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Q&A: Does Truck with 6-1/2 ft bed Have to Use Slider Hitch for Turning Clearance with Fifth Wheel Hitch
- Search Results: trailer tires and wheels
- Search Results: gooseneck hitch
- Shop: Suspension Enhancement
- Q&A: Recommended Lock for MORryde GooseTech 5th Wheel to Gooseneck Pin Box
- Article: 4 Steps to Choosing Your 5th Wheel Pin Box
- Search Results: trailer wiring
- Shop: Gooseneck Hitch
- Article: How to Measure for Trailer Hitch Drop
- Video: B&W Companion OEM 5th Wheel Hitch Manufacturer Breakdown
- Q&A: Correct MORryde GooseTech for Grand Design Solitude 310GK
- Q&A: Recommended Tonneau Cover and Ladder Rack for a 2026 Chevrolet Silverado EV
- Search Results: trailer jack
on 5th Wheel Gooseneck Adapter
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.