There are "studs" in the wall and you should be able to find them. Probably just 2x2s but you should be able to figure something out that spans a couple of them. If that doesn't work you might be able to hang a TV sized piece of plywood down from the 2x2 that frames the horizontal top of the bathroom wall. Be careful not to drill into the shower supply lines. My 26 HE has the same bedroom and bathroom configuration as your coach and it came with a TV support structure inside the wall. I called Thor and they said it was 1/2 inch plywood. I found it with a stud finder and it worked a treat. Not sure yours has it as mine also already was wired for TV and I don't think the 22 FEs come that way. Best of luck.
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