I have taken the door apart. There is a couple of factors contributing to the sagging door. The straw that broke the camels back appears to be the four screws that hold the aluminum frame to the internal wooden frame of the door on the hinge side of the door. These were all broken off about 1/4 inch below the head. I am pretty sure that they broke due to the stress put on them by the wooden frame of the door rotting at the bottom. (and the loss of strength due to a bit of rusting) The lower section and the handle side of the door were pretty weak from getting old and rotten.
I took the outside aluminum frame completely off and peeled the outside and inside skin back to reveal the rot. A bit of prying broke the rotten parts away from the good. I cleaned everything as well as I could and bought some similar sized wooden parts and planed them down to be as close to the original as I could. Using a really expensive multi purpose glue I reassembled the skins on the frame and screwed the aluminum frame back. Before assembly I made sure that I needed a "square" door and made it to fit the opening on the trailer.
To insure a few more years from the repair I increased the support screws on the hinge side from 4 to 9. I also used rust resistant screw. I am sure the extra support will help.
It works so much better.
OK Donna & Chris
HOW does the door actually come off?
I see a vertical row of screws on the inside of the trailer, on the hinge side. Do you just remove those? Then what?
I don't see any screws on the outside, nor any other types of obvious fastening.
My door doesn't seem to have any real play up and down, but does stick at the bottom when closing. I have to use my knee outside, or lift from the inside to close it all the way. Is there a way of 'adjusting' it, IF the frame isn't really rotted out?
I'm reluctant to start dis-assembling, until I have an idea what I could get into. It does look like, whatever I start to remove will require caulking and fiddling to refit to reassemble.
Should I leave it alone?