Which Fifth Wheel to Gooseneck Adapter Fits 2018 Keystone Fusion 424

Updated 04/16/2025 | Published 04/14/2025

Question:

I have a 2018 Keystone Fusion 424 5th wheel trailer with a Rota Flex hitch. Please tell me which hitch i need to completely remove the Rota Flex and replace with gooseneck. Appears to be 6 bolts holding the current hitch on. Thanx

asked by: Rick C

Expert Reply:

Hey Rick, since we know your 2018 Keystone Fusion 424 has a Lippert 1621 style pin box on it currently the correct Gen-Y fifth wheel to gooseneck adapter would be the part # GY38FR.

Or if you were wanting a Reese Goose Box instead you'd want the part # RP85FR.

If you want an air spring the Goose Box is the correct route, if you'd prefer a rubber torsion spring for cushioning you'd want the Gen-Y. Worth mentioning is that the Goose Box is technically only option that doesn't void warranty.

expert reply by: Jameson C