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Will the Reese Goose Box Fit a 2018 Grand Design Momentum 399TH


Hi- Will the Goose Box fit on a 399TH with a Trailair® Roto-Flex™ pin box? RP94623 And can I install this myself? Thanks,


Expert Reply:

The only Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter we have that is rated for the weight of your 2018 Grand Design Momentum 399TH is part # RP94720 which has a 20,000 lb capacity and is designed to be a replacement for Lippert 1621, 1621HD, and 0719 pin boxes. If you have one of these pin boxes on your trailer now then you can use the Reese Goose Box.

If you do not know the model number of your Trailair Rota-Flex 5th Wheel Pin Box then you can look on the pin box itself or call the trailer manufacturer with your VIN. I have attached the install instructions of the Reese Goose Box so you can see if you are willing to do the work yourself.

expert reply by:
Conner L

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