Recommended Pin Box For A 2022 Grand Design Momentum 351MS With A Lippert Rhino Box

Published 01/26/2023

Products Featured in This Question

MORryde Cushioned 5th Wheel Pin Box for 18K to 21K Trailers w/ Lippert Rhino

(255)

$799.99

Curt Flex Air 5th Wheel Pin Box - Lippert Rhino - 21,000 lbs

(194)

$2064.75

MORryde Cushioned 5th Wheel Pin Box for 14K to 18K Trailers w/ Lippert Rhino

(255)

$799.99

Question:

Just to be sure are fifthwheel is 18000 Gvwr because the 8000 axles option and Brake Disc , do you steal keep the Morryde MR83QR ? Or go to MR55QR ? Thank's

asked by: Marc B

Expert Reply:

The Rhinobox was definitely an unpopular choice for manufacturers to go with so swapping it out with the MORryde Cushioned 5th Wheel Pin Box for 18K to 21K Trailers w/ Lippert Rhino # MR55QR would definitely give you a major improvement in ride quality.

That being said, a 2022 Grand Design Momentum 351MS has a GVWR of 16,800lbs so you would want to use the MORryde Cushioned 5th Wheel Pin Box for 14K to 18K Trailers w/ Lippert Rhino # MR83QR instead. The internal spring for this pin box is the appropriate range for your RV's GVWR, which will give you optimal ride quality, whereas the # MR55QR you were looking at is designed for a heavier trailer.

The Curt Flex Air 5th Wheel Pin Box # LC65VR that Lippert tried recommending is also a great choice though. This pin box will give you more support if you're experiencing a lot of up-and-down motion, unlike the # MR83QR. It's quite a bit more expensive but it is going to do a better job because of the internal air bag, which allows you to fine tune your ride by raising or lowering the psi in the bag.

If you experience a lot of up-and-down motion or drive on really rough roads then I recommend the # LC65VR. If you're experiencing more front-to-back motion and don't want to spend a fortune then the # MR83QR is more than enough.

expert reply by: Kevin C

Manon

1/26/2023

Just to be sure are fifthwheel is 18000 Gvwr because the 8000 axles option and Brake Disc , do you steal keep the Morryde MR83QR ? Or go to MR55QR ? Thank's

Kevin C.

1/26/2023

If the GVWR of your trailer really is 18k you would still fall within the 14K to 18K range of the # MR83QR. I recommend double-checking the GVWR just to clear up any confusion. There should be a sticker around the front of the driver's side of the trailer with this number listed. The GVWR is the fully loaded weight of the trailer so you most likely will be well under that weight unless you're really loading it up with items and hauling with a full fresh water tank and full propane tanks.