Will The Curt Flex Air Pin Box Add More Clearance Than The Rota-Flex Pin Box

Updated 07/20/2022 | Published 07/19/2022

Products Featured in This Question

Curt Flex Air 5th Wheel Pin Box - Lippert 1621 - 21,000 lbs

(197)

$1787.85

Trailair Rota-Flex 5th Wheel Pin Box - Lippert 1621 or 1621HD - 18,000 lbs

(89)

$722.55

Question:

I have a 2015 Grand Design Momentum 380TH toy hauler that came factory with a Trailair Rotaflex pin box. I also have a 2021Chevy Silverado 3500 tow vehicle with factory hitch mount and Reese Hitch set as high as it will go but still need about 2 more inches of clearance between ffifthwheel and truck bed. Will this Flex air pin box fit and give me the extra clearance I need? Also, the stock hitch is aas low as it can go without sacrificing a bolt on each side which I prefer not to do. Thanks,

asked by: Robert W

Expert Reply:

The Curt Flex Air 5th Wheel Pin Box - Lippert 1621 # LC369535 is approximately 19-9/16" in height, whereas the Trailair Rota-Flex 5th Wheel Pin Box - Lippert 1621 # LC328330 is approximately 13-3/16" in height.

This will give you the additional clearance you were looking for but you will need to check the bolt pattern of your current pin box to ensure that it is in fact a 1621 bolt pattern. If you can find the serial/RPO numbers on it we can look it up or you can use the attached guide below to determine the bolt pattern.

expert reply by: Kevin C