This may not be what you want to hear, but here's my story. You're going to have to remove the flooring. We had massive water damage (plumbing leaks) in our 2017 Challenger resulting in mushy floor in multiple spots. One spot, behind the drivers seat, was the result (we were told) of a trim piece not being properly sealed. The full wall slide had to be removed, as well as the vinyl floor, damaged particle board, and foam insulation down to the metal frame. It is not an underside repair.
My thread:
https://www.thorforums.com/forums/f8...irs-20462.html
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