Is There Morryde Cushioned Pin Box that Can be Used on Alliance 22ML 5th Wheel
Updated 04/23/2026 | Published 04/18/2026
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Question:
Hi I am looking at an Alliance 22ml that has a curt roto flex pin box on it? Will i be able replace that pin box with a Morryde cushioned pin box? Thanks
asked by: Tim
Expert Reply:
Hey Tim, I did some digging and it looks like your Alliance 22ml would have the Rhino box style pin box on it currently so the correct MORryde cushioned pin box replacement would be the part # MR45ER.
Below you can see a customer of ours confirms that the Rhino is what you have so the correct part number would be the # MR45ER.
If that's not what you have it would most likely be the 1621 which the part # MR64VR you referenced would replace. On the pin box there should be a label or sticker that has it's info listed on it.
Product Page this Question was Asked From
MORryde Cushioned 5th Wheel Pin Box for Up to 11.5K Trailers w/ Lippert 1621 and 1621HD
- 5th Wheel Pin Box
- Upgraded Pin Box
- Reduces Chucking
- 21000 lbs
- Rubber Spring Suspension
- Fixed Turret
- Lippert 1621
- Lippert 1621HD
- MORryde
more information >
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on 5th Wheel Pin Box
Steve M.
4/23/2026
Not to contradict Jameson, but I own a 2025 Alliance All Access fifth wheel 23ML and purchased and installed a Morryde pin box last week. I worked with etrailer and did confirm that th3 23ML does have the Rhino pin box. The Alliance 23ML (I assume your 22ML was a typo) has a GVWR of 10,495lbs. For a Morryde Rhino pin box for units under 11,500lb, the correct etrailer# is MR45ER. This crosses to the Morryde model # RPB77-FD-03. I installed the Morryde MR45ER last week but have not towed with it yet. You could install the MR83QR as Jameson suggested but that is for trailers rated 14k-18k so unless you load the trailer way over the 10,495 it won't cushion as much as that pin box will be substantially stiffer. I'll defer to Jameson for his opinion.....