If I was unfortunate to have that happen to me, I think I'd go for a couple extra dollars and use the outdoor "green" plywood that will not rot if it gets wet. (wolmanized is the name i remember) I would also paint the underside of the plywood with a good exterior paint and use stainless screws.
also, Remember that all the creepy outside 6,8,10, 12 and up legged bugs outside are always testing ways to get inside your RV. don't leave them a way in....
GOOD LUCK
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