Which MORryde Pin Box will Replace RPB72-1621SHD of Jayco Seismic
Updated 05/14/2026 | Published 05/09/2026
Question:
I have the RPB72-1621SHD that has 23,000 GVWR printed on the label. Would I need to replace all the parts shown in the diagram along with MR74VR? I would prefer to do so as this is on a 2013 Jayco Seismic. Do you sell a complete kit?
asked by: Lewis M
Expert Reply:
Hey Lewis, since you have a 1621 style pin box on your Jayco Seismic the correct MORryde cushioned pin box to replace it would be the part # MR74VR that you referenced. This wouldn't require any additional components beyond what comes with the pin box. With that said this specific pin box was designed for trailer weights between 11.5k and 14k. Do you know what your Seismic weighs or the GVWR? If you give me the specific Seismic model I can also look it up for you.
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Lewis M.
5/13/2026
The Seismic Model is the 3914.
Jameson C.
5/14/2026
Product Page this Question was Asked From
MORryde Cushioned 5th Wheel Pin Box for 11.5K to 14K 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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Jameson C.
5/12/2026
Since you have a 19k GVWR RV the correct MORrdye pin box replacement would be the part # MR74VR. This is the correct weight rating.