Will Curt Helux Replace Pin Box Alliance Fifth Wheel

Updated 12/10/2025 | Published 12/08/2025

Question:

Hello, Want to know if the Curt Helux Shock-Absorbing 5th Wheel Pin Box - Lippert Rhino is compatible with my Alliance? It has a CURT Rota-Flex pin box that I need to change out because it is an articulating head. Also want to know if it has an articulating head on the pin box? Because I want to purchase the Curt Crosswing 20K Single-Point 5th Wheel Hitch and it states on their website that it cant be an articulating head. Thanks Bobbie Sirin

asked by: Bobbie S

Expert Reply:

Hey Bobbie, while I don't know which specific Alliance fifth wheel you have our understanding is that the Rhino Box style pin box is very common with them which would mean the Curt Helux part # C85MJ would be the correct replacement for a cushioned and fixed replacement. Can you verify for me that you have the Rhino box? Or at least get me the model of your fifth wheel?

expert reply by: Jameson C

Bobbie S.

12/10/2025

Hi Jameson, It is an Alliance Avenue All Access 29RL and it has a Roto Flex on the pin box. Thank you, Bobbie Sirin

Jameson C.

12/10/2025

@BobbieS Thanks for that but the Roto Flex is a type of cushioned pin box but it does not identify the bolt pattern of it like I would need. If you can look at the pin box and see if you can find the part number listed on it that would be what I would need. Unfortunately we haven't determined the pin box model your RV has in the past either so I wasn't able to check that and find what I need either.