Which Curt Flex Air Pin Box Fits 2022 Alliance Paradigm 310RL With Rhino Box
Updated 09/02/2025 | Published 08/01/2025
Question:
I am looking to upgrade the pin box on our 2022 alliance paradigm 310rl to a flex air pin box. I have seen other inquiries on your site about this exact switch and e-trailer responded that the existing pin box was the Lippert 1621 bolt pattern. I contacted Lippert and was told that it is the Rhino pin box. The current pin box is a roto flex ser no S008727984, LCI 8128071. Please let me know which is the correct box for my trailer. Thank you
asked by: Jim M
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Expert Reply:
Hey Jim! I just ran that by Lippert do double check and you do have a Rhino Box bolt pattern on your 2022 Alliance Paradigm 310RL. The correct replacement is the Curt Flex Air 5th Wheel Pin Box - Lippert Rhino - 21,000 lbs # LC65VR. Some of those other answers were probably for a different year or slightly different model. Nothing is ever really absolute when it comes to parts in the trailer world so it is always best to double check.
Any big trips planned with your 5th wheel before summer wraps up?
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Product Page this Question was Asked From
Curt Flex Air 5th Wheel Pin Box - Lippert Rhino - 21,000 lbs
- 5th Wheel Pin Box
- Upgraded Pin Box
- Absorbs Road Shock and Reduces Chucking
- 21000 lbs
- Air Ride Suspension
- Fixed Turret
- Lippert Rhino
- CURT
more information >
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Robin H.
9/2/2025
Hey Jim, did you have a chance to install the Curt Flex Air pin box on your 5th wheel? I'm curious to know how it worked out for you, as it might help others considering a similar upgrade.