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How To Find Correct Reese Goose Box 5th-Wheel-to-Gooseneck Adapter for 5th Wheel Trailers


looking to upgrade. want to know if i need the shim plates. My trailer measure 12 1/4inch between tabs


Expert Reply:

In order to find the correct Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter for your trailer you need to know you pin box pattern. This can be done by measuring (see link below) or by reaching out to the trailer frame manufacturer. In regards to width, there are two standards, 12" like what a Lippert 1621 uses and 12.5" like what a Lippert 1716 uses. If you have a Lippert 1621 then use part # RP94716 or part # RP94720 or if you have a Lippert 1716 use either of the same part numbers for the pin box but also add the part # RP94720.

I am not aware of any 12-1/4" wide pin box options.

expert reply by:
Conner L

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