After researching the forum's "door section" I have not found a comparible situation to my problem.
My 1968 Airstream
24' Tradewind has a solid one piece door jamb screwed to the trailer, and a very large single hinge the door is mounted to.
I have been geographically forced to travel over long sections of interstate highways under construction, with huge "bumps" at bridges and overpasses.
I recently noticed that my door was getting very hard to lock. Then after this last trip, the door would not lock at all.
At closer inspection I observed black powder at the bottom right side of the door frame and more black powder on the lower part of the one-piece door hinge.
Checking closer, I found that the lower right corner of the door frame was crack and broken, allowing the bottom right of the door jamb and attached exterior wall to move in and out 1/32 to 1/16 of an inch.
The movement and rubbing causes the alum. to rub and make the black powder. The same movement was causing the door hinge to rub and cause the plack powder there.
This also caused and exterior outer skin rivet, next to the bottom right of the door frame, to work loose and fail.
Does anyone have a procedure to follow for a proper fix?