I just took a closer look at your picture of the bent lift arm. In the side of the camper, above and to the right of the arm, there appears to be an empty hole in the wall. There is supposed to be a special bolt in this hole, going all the way through the wall. This bolt secures an assembly called the "pocket stop". This device controls how far the shell opens, and keeps it straight and square. It must be in place - if your TM has lost it, it must be replaced.
I am not the resident expert on the pocket stop. I urge you to spend time here on the forum, using the search tool on the term "pocket stop" in posts by Larryjb.
As the well-known advertisement says, don't leave home without it.
Bill
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