The trailer hitch on my RT had about 1/2 inch vertical play, rocking on the swingarm. When I removed it to replace the tire, I saw that one of the plastic shims on the right side was missing. After measuring the proper thickness and installing the shim I made, all the play was gone. Just a heads up when anyone else notices their hitch is loose in the vertical direction. I also had a fair amount of wear on the hitch thru bolt because of the movement.