If you need to inspect the floor from the underside, then you really have no option but to remove it.
Replacing it, now that is the $64 thousand dollar question?
If the floor is not damaged, rather than trying to replace it, you can use a good exterior house paint and simply paint the exposed plywood floor. Or spray the exposed wood with Tompson's Wood Sealer, used mostly on house porch deck work. It's good stuff, penetrates the wood and seals it.
It's a far, far better way of protecting untreated wood than simply covering it with a Nylon material.
When you replace the chloroplast I can't imagine water splashing up from the road to ever reach the underside of the floor.
I had a pop-up (Starcraft Venture, 1999 model) and the under side of the camper was untreated, bare plywood, exposed to everything. We had the pop-up for 6 years and I inspected the under side of that little trailer often. There was never any signs of water damage under there. I also treated it with Tompson's when we first purchased the camper.
I think the Draco material is the manufacturers way of installing something really cheap and fast, rather than using a good paint or wood sealer to protect the exposed wood on our campers.
If you have to inspect what's going on, yes ..... remove it.
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2019 Montana High Country 375FL
2014 Chevy Silverado Duramax, 6.6L Dually
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