Sam:
Not trying to talk you out of using corrugated roofing, but I see a couple of disadvantages: (1) it isn't that easy to make cuts that would be close-fitting around drain pipes, shackles, drain pulls, etc. The corrugated pattern would still leave voids adjacent to these objects. (2) unless you use a thicker gauge of roofing, the plastic roofing tends to become brittle over time.
Coroplast or some other similar material would lend itself to easier and closer-fitting cuts. If one of your concerns is to be able to inspect the plumbing, wiring, etc., what about cutting out a couple of "inspection" sections so you can get a peek inside? One in the front area and a second in the rear. You could cover the inspection hole with a larger piece of Coroplast which would be screwed or otherwise fastened to the main covering. I do not, BTW, have shares in Coroplast!
I am not sure whether a tight, sealed and close-fitting underbelly would prevent rust from forming -- it might reduce it somewhat but I don't think that having some rust on some of the metal is a cause for concern.
The unwanted visitors you referred to can and will find all sorts of tiny voids to gain entry to the inside. Any small opening - not only in the underbelly - found in any outside compartment provides easy access for mice. It's a tough job to find and seal every little hole. Just when you think you have.............
Good luck with this project. I am sure someone on here will provide a solution that will work for you!
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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