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Which Reese Goose Box Fifth Wheel Gooseneck Adapter Fits 2020 Grand Design Momentum 351M


I have a 2019 Ford F450 with the puck system and I want to use a goose box hitch and see they now have a 20k one. I have a 2020 Grand Design Momentum 397TH and wanted to know if that 20k goose box will work or do I need one that’s more then 20k?


Expert Reply:

Your 2020 Grand Design Momentum 351M has a Lippert 1621 pin box so for a Reese Goose Box you'd want the part # RP94720 like you referenced. This Goose Box has a 20k capacity which is the exact weight your trailer could be if it was loaded to it's max capacity as it's GVWR is 20k as well. Unloaded the toy hauler weighs 15,802 lbs.

expert reply by:
Jameson C

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