How To Determine If Your 5th Wheel Base Rails Are Industry Standard Rails

Updated 10/04/2021 | Published 10/03/2021

Question:

I have a 16 k sliding 5th wheel hitch and was wondering if a curt 20k sliding 5th wheel hitch will for my existing rails?

asked by: Rob K

Expert Reply:

If your rails are ISR (Industry Standard Rails) then yes, you can easily swap out your 16k sliding 5th wheel hitch for a Curt A20 5th Wheel Trailer Hitch w/ R20 Slider - Dual Jaw - 20,000lbs # C16541. An easy way to see if the rails are ISR is to measure the distance from center to center of the rails. If you get a 22" measurement like in the picture below then you have ISR rails.

expert reply by: Kevin C