So we just started using our new hitch with our 1996 Coleman cheyenne, and after our first trip I noticed the hitch ball had loosened enough so that I could turn it with my hand. So I got out the wrenches and tightened the heck out of it. We recently just went on a 5+ hour trip to northern Ontario and after getting back I noticed the same thing again, it's loosened up once more. I have yet to put grease on the ball due to budgetary reasons, but I am at a loss for how to stop this, as I tightened it about as much as I can physically tighten it myself. Will putting grease on the ball allow the trailer to not loosen the ball?