some folks have had luck getting the frame diagram from Thor. I don't think it's a dimensional drawing, but at least it would give you an idea of what is there.
On my coach, I can see where the framework is on a humid summer morning with the AC blasting inside... the condensation forms less at the frame members.
I wonder how well one of those electronic stud finders would pick it up.
Regardless, I'm doubtful that it has reinforcement specifically for this purpose, but you never know for sure.... even if it doesn't, I'd bet that with some thought about whatever the existing framework is, and/or adding a backer plate on the inside, I'd bet it's not that hard to do.
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