5th Wheel Makes Loud Clunking at Stops and Starts

I had a similiar problem with my Reese. The head will move forward and back about 1/8 of an inch on the lateral pivot pin that can bee seen above and to the left of the R in Reese logo.

If you look at my picture you can see where I inserted a couple 1/8 inch heavy duty nylon sheets that are held in place by the two
1/4 inch bolts you can see.

I put the sheets toward the front so that there was no pressure on them while under way and trailer pulling the hitch head to the back of the hitch.