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Can Trailair Flex Air Pin Box Be Used With Gooseneck Adapter  

Updated 09/12/2025 | Published 08/19/2025

Question:

My camper has a trail air flex air fifth wheel king pin. Looking at a FOrd that has the factory good neck set up in the bed. Is there a 5th to goose neck adapter that would work with this set up?

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Expert Reply:

Hi Steve; a Trailair Flex Air Pin Box like # LC328484 cannot be used with a gooseneck adapter of any kind according to Lippert. You will have to use a traditional 5th wheel hitch or you can swap out the pin box for something like the Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter # RP85FR which fits Lippert 1621, 1716, 0719, Rhino, and Fabex PB 600 bolt patterns.

Does your Ford have the puck system along with the gooseneck? If it does, I would be happy to make a 5h wheel hitch recommendation if you can let me know the year and model.

expert reply by:
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Robin H
Reese Goose Box
Reese Goose Box
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Robin H.

9/12/2025

Hi Steve, did you find a solution for your Ford's setup? If you're still looking for a recommendation, I'm happy to help.

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