I had a similar issue when I bought our preowned Montana. I fixed it although not pretty, but who was going to see it. I inserted an oversizepiece of sheet metal above the coroplast then drilled several self tapping screws thru the coraplast into the sheetmetal. A little tricky getting started nut it worked. Then I used Gorilla Tape over the cracks to seal. Maybe someone else has done something easier on this forum, but this has worked well for me.
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