Super Glide Hitch owners

On only our second outing, DW commented that she thought the 5th wheel was "clunking" when stopping or starting. After her comments I noticed also, I did not feel it but I did hear it. Today while cleaning up and putting things away I noticed that the capture plate was a little loose? Not much but I could move it. It is attached using a single set screw, nylon washer, and locking nut, so it can not be taking any weight. I removed it cleaned it and put a little sylicone on the surface and along the sides, then reinstalled it. When finished, it did not move and felt secure, I tHink that is how it is supposed to be installed. (I did not originally install it or pay any attention to it when we picked up at the dealer. They did mention that it should be removed if the 5th wheel would be towed by anything other than a superglide)!

Now is this a maintenance item thAt should be checked? Was it originally installed incorrectly, or did I do something unusual that lossened it??? I did practice hitching and unhitching probably 6 to 8 times to get into practice of what to do and not do when hocking up to the rig. Your comments and input are welecomed