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Can Rhino Box Pin Box Fit 1621 Bolt Pattern  

Updated 01/27/2026 | Published 12/29/2025

Question:

Will the rhino pin box fit in place of the 1621 pin box

0

Expert Reply:

Hi Steve; a pin box with the Lippert Rhino bolt pattern will not fit the 1621 bolt pattern. You have to match the bolt pattern on your 5th wheel when choosing a replacement. Were you wanting to get the Rota-Flex you were looking at? Assuming you are you can choose from the following:

-Trailair Rota-Flex 5th Wheel Pin Box - Lippert 1621 or 1621HD - 18,000 lbs # LC328330

-Curt Rota-Flex 5th Wheel Pin Box - Lippert 1621 - 21,000 lbs # LC328329

expert reply by:
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Robin H
Rota-Flex
Rota-Flex
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Etrailer Expert

Robin H.

1/27/2026

Hey Steve, how did things work out with the Rota-Flex pin box for your 5th wheel? Your feedback could help others trying to match the right bolt pattern for their setup.

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