Pictures would help. It's hard to see what's wrong without a picture.
We tore a corner out of our 1970's cabover camper and DH replaced the wood in the corner to fix it. It worked fine after that, we could jack it up and down without problem.
It sounds like your TM may have been used fairly roughly to have these things happen.
We have the same year as yours and ours is still very structurally sound.