Karen. I once saw an interesting way to take the sag out of one of these doors and was going to do it on my 79 Boler. I didn't do it because I found a sweet deal on a Casita
and ended up selling my Boler last Spring. Anyway
This door fix involved 2 aluminum strips as long as the door is wide and about 2 inches wide. One strip was secured, using glue and pop rivets, to the inside of the door about 2 feet up from bottom and the other about on the inside just above where it touched the floor.
To these stirps I attached 6 - three to the top aluminum and 3 to the bottom, "L" shaped hangers that held 3/8 rod through the bottom of the "L".
It then showed 3/8 inch rod cut into 6 pieces and 3 into the top "L" and 3 into the bottom with a turn-buckle between them so they could be tightened to bring the bottom of the door in, where it would close tight.
The rods have to be bent so the turn buckles would work but it looked like an easy and permanent fix for the bottom sag of the door.
Has anyone actually done this???