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
(click to enlarge)
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?
(click to enlarge)
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 >
Continue Researching
- Shop: Curt Flex Air 5th Wheel Pin Box - Lippert 1621 - 21,000 lbs
- Search Results: 5th wheel pin box
- Shop: Curt Helux Shock-Absorbing 5th Wheel Pin Box - Lippert Rhino - 24K GTW - 4,000 lbs TW
- Search Results: nerf bars ~ running boards
- Shop: Fifth Wheel Hitch
- Shop: Curt Helux Shock-Absorbing 5th Wheel Pin Box - Lippert Rhino - 24K GTW - 4,850 lbs TW
- Shop: Curt Helux Shock-Absorbing 5th Wheel Pin Box - Lippert Rhino - 24K GTW - 5,400 lbs TW
- Search Results: helux
- Shop: Curt Helux Shock-Absorbing 5th Wheel Pin Box - Lippert Rhino - 18K GTW - 3,500 lbs TW
- Shop: Curt Air Ride 5th Wheel Pin Box - Lippert 1621 & 1621HD - 21,000 lbs
- Q&A: Why Would Lippert Recommend Adding Higher Rated Flex Air Pin Box to 2023 Highland Ridge Roamer
- Video: Review of the Curt Flex Air 5th Wheel Pin Box
- Shop: Curt Flex Air 5th Wheel Pin Box - Lippert Rhino - 21,000 lbs
- Search Results: suspension enhancement
- Search Results: air suspension
- Q&A: Length Of The Curt Flex Air 5th Wheel Pin Box # LC369535
- Q&A: Comparison of Curt LC158778 and Curt LC369535 Flex Air Pin Box for Lippert 1621HD
- Search Results: helux pin box
- Q&A: Recommended Curt Helux Pin Box for a Rhino Bolt Pattern
- Shop: Suspension Enhancement
- Search Results: 5th wheel hitch
- Article: 4 Steps to Choosing Your 5th Wheel Pin Box
- Q&A: How To Determine Which Pin Box I Have and What Replacements Are Available
- Q&A: Dimensions Of Lippert 1716 Pin Box # LC1324791
- Q&A: Determining Fitment Of A Curt Flex Air 5th Wheel Pin Box # LC65VR
- Video: Checking Out the Curt Flex Air 5th Wheel Pin Box
- Video: How to Set Up Your Curt Air Ride 5th Wheel Pin Box on a 2021 Highland Ridge Open Range Fifth Wheel
- Video: All About the Curt Air Ride 5th Wheel Pin Box
- Video: Curt Flex Air 5th Wheel Pin Box Review
- Shop: Nerf Bars - Running Boards
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.