Correct Reese Goose Box for a Lippert 1621 Pin Box
Updated 10/22/2025 | Published 04/07/2025
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Question:
I have a Lippert LCI item 1985441 S/N 019-000174670 fifth wheel pin box, I want to change it to a goose neck set up. What do you recommend.
asked by: Bryce E
Expert Reply:
Hey Bryce (great name by the way), I spoke with Lippert and they said that this is a 1621 pin box, meaning the Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter # RP85FR you're looking at will be the correct pin box.
This pin box has a 20,000 lb capacity, has a simple bolt on install, and will work with a 2 5/16" ball. You're also going to need the BulletProof Hitches 3/8" Safety Chains with Clevis Hooks # BPH86RR.
If I can help with anything else, please feel free to drop a comment and let me know!
Product Page this Question was Asked From
Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter - 20,000 lbs
- 5th Wheel Gooseneck Adapter
- Adapts Trailer
- 5th Wheel Trailer to Gooseneck Hitch
- No Extra Clearance
- 20000 lbs GTW
- Replaces Pin Box
- Shock Absorbing
- Fabex 600
- Lippert 0719
- Lippert 1621
- Lippert 1716
- Lippert Rhino
- Reese
more information >
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Jon G.
10/22/2025
Hey Bryce, how did the swap to the Reese Goose Box go on your fifth wheel? I'm curious if the fit and ride quality met your expectations. Your update could make it easier for others looking to move from a pin box to a gooseneck setup.