It also causes the sheet metal to tear.
First I added two pieces of 8' long, 3/4" wide, 1/8" thick, 90 degree angle pieces of aluminum that I bolted together. That helped.
That wasn't quite enough, so I added a section of 8', 1.5" wide, 1/8" thick, 90 degree aluminum.
Even better now. But this is just a temporary fix to hold the door over for a week until I get a new and better one.