Determining The Correct Flex Air Pin Box For A Grand Design Solitude 391DL 5th Wheel Trailer

Updated 07/18/2023 | Published 07/17/2023

Question:

I have a Grand Design Solitude 391DL which flex air pin box do I need?

asked by: Eric M

Expert Reply:

To determine which Flex Air pin box will fit your Grand Design Solitude 391DL you'll need to first determine your pin box bolt pattern. There will typically be a sticker somewhere on the pin box or mounting ears that has a serial number, RPO number, and LCI item number on it (pictured below) that we can use to determine the pattern. If not then you'll need to use the attached help article below to measure for your bolt pattern.

For example, the Curt Flex Air 5th Wheel Pin Box # LC369535 you were looking at has a 1621 bolt pattern. Once we know your bolt pattern I'll be able to find the corresponding fit.

expert reply by: Kevin C