Reese Goose Box for 2023 Fuzion Impact 415 With Rota-Flex Pin Box
Updated 01/19/2026 | Published 08/07/2024
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Question:
I have a 2023 Fuzion Impact 415 that I am considering replacing the pin box with a Reese goose neck pin box. It currently has the rota-flex LC328329 which I believe uses the lippert 1621. The pin box is rated for 21,000lbs but the gvwr for our fifth wheel is 19,000 lbs with a hitch weight of 3,155 lbs. Would the 20k Reese gooseneck pin box work with our fifth wheel. If so, which one? Thanks
asked by: David
Expert Reply:
Hi David; the Curt Rota-Flex # LC328329 does use the Lippert 1621 bolt pattern. With your GVWR of 19,000 lbs the correct Reese Goose Box is the # RP85FR you were looking at. The capacity is a little lower than your current Rota-Flex but that won't be a problem. The 20k model is also the highest capacity offered by Reese.
If you would like more of a buffer you could also use the Gen-Y Hitch Shock Absorbing 5th Wheel to Gooseneck Pin Box # GY66FR. This replaces a 1621 and has a towing capacity of 30,000 lbs. The correct Gen-Y is determined by the formula GVWR x 0.22 = TW so with your 19k GVWR this 5,500 lb pin weight model is the right one for your 2023 Fuzion Impact 415.
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Robin H.
1/19/2026
Hey David, how did things go with the Reese Goose Box on your Fuzion Impact 415? Did the fit and towing performance meet your expectations? Your update could make it easier for others comparing the Reese and Gen-Y options.