I have asked a few questions about fixing my lower pop-up door but can't seem to find a definitive answer anywhere on the internet. Does anyone here know how to fix this door. I have the trailer perfectly level from front to back and side to side and it has not fixed this problem. I was just thinking of putting in a shim on the right-hand side under the hinge area using aluminum and straighten the door out. Not sure if this is good or not.