How To Fix Loose Fitting On the Demco 5th Wheel Rail Adapter for a 2020 GMC Sierra 2500

Published 10/22/2019

Question:

Shipping on my demo dm6333 fifth wheel adapter was fast but I have a problem with the fit of the unit. After the installation and lock down of the unit I have a lot of play from the right upper corner to the bottom left corner so when in tow it sounds like something is about to break . The fit from the upper left to the lower right seems to be ok just a lot of rocking back and forth from the right upper corner to the lower left corner. I don’t imagine this could be normal towing the weight of a fifth wheel camper?This is installed on a 2020 GMC 2500 Sierra

asked by: Donnie S

Expert Reply:

If you are having issues with the Demco 5th Wheel Rail Adapter part # DM6333, you are first going to want to play with the washers i.e. adding more to one side and then taking them away from another. This is explained for you in step two of the installation instructions which I have attached for you.

I spoke with Demco and they stated that you should not be concerned with how the adapter sits in relation to the bed but rather the actual pucks. If one handle feels tighter than another that is a good sign that you just need to adjust the washers but the pucks are also not always perfectly level from the factory.

expert reply by: Conner L