Class C overhead movement causing seal failure

More than likely your side walls look like this, which is on a 2001 Itasca Sundancer 31C
As you can see, other than the outside framing there are only a couple of small braces which are welded to the main framing. A weld on one of these corner braces was broken. The front wall has no metal framing. It's just a combination of a fiberglass exterior panel, along with wood and pieces of foam.