Compatible Upgraded Pin Box Replacement For A MORryde RPB72-770-06 Pin Box

Updated 08/10/2021 | Published 08/09/2021

Question:

I have 2008 newmar 38 foot x-aire fifth wheel the original pin box is rpb72-770-06 what other pin box will work for replacement

asked by: Thomas T

Helpful Expert Reply:

The MORryde RPB72-770-06 Pin Box you have is a Fabex 770 bolt pattern so the Trailair Air Ride 5th Wheel King Pin # UF35-946212 that you linked to will be a compatible fit. This air ride pin box will offer you smooth, stable towing with your fifth-wheel trailer by replacing your ordinary pin box with an air-ride-equipped model. The scissoring action of the coupler allows the interior air bag to absorb road shock so that you won't feel it.

When you encounter uneven terrain on your trip or hit a pothole on the highway, the Trailair pin box compresses, transferring the road shock to its internal air bag. A built-in air spring ensures that this compression occurs in a controlled fashion so that the air bag doesn't burst. It also causes the pin box to appropriately rebound, positioning it so that it's ready for the next bump in the road.

expert reply by: Kevin C