I believe that is called Coroplast and it is used on most with an enclosed underbelly. I ran eight years on my first fifth wheel with no issue and on my 4th year with this one. That material may be tougher than you think, We used something similar in the factory and it held up very well there.
Goody Two Shoes and the Filthy Beast
2008 Chevy Silverado 2500HD
Duramax and Allison 6 speed
2012 Wildcat 282RKX
You can't make things idiot proof, you can only make them idiot resistant.