Originally Posted by jornvango
When we bought it last October, we were told by the previous owner that the door needed a good push (slam) to close. I'm assuming this caused the vibrations.
Since I put some grease on the lock, the door closes much better (normal) ... but the hinge is a little loose.
The striker bolt and pocket should be lubed periodically with silicone spray.
Tighten the hinges as need be, as they will only get worse.
Check out the reason for the loose hinges.
Excessive rated tow vehicle, excessive rated hitch bars, unbalanced running gear and/or bad rubber rods within the axles.