2004 Chev Blazer is my tow vehicle. It has the factory trailering package with removable receiver hitch. I was towing my 14' Aquarius w/50HP Mercury and whenever I came to a stop I heard and felt a clunk. I immediately pulled over and checked the coupler but everything was snug and secure, so I continued on my way. The clunk is enough to give the Blazer a little shake but nothing serious. When I got to my destination and unhooked the trailer I wiggled the hitch and saw that it has just a tiny bit of up and down play. Thought about getting something to use for a shim, but dont want it to get stuck in there and then I cant take off the hitch. If its nothing to worry about then I guess I will just learn to put up with the annoyance. Thanx for your input.