Just food for thought....
I put some cheap outdoor carpet on the passenger side of the deuce for when we went mudding so my girlfriend had a little more traction gettin in and out, when we got back it was late and I didn't clean the deuce up, a week later when I pulled the carpet out, it was still dripping wet, plus rust was already starting to show underneath. This is the exact reason I don't use bed liners on trucks without a tonue/cap.
If you really want to put some kind of flooring down, go to Walmart and get the roll on bedliner stuff, i believe its called herculiner?? I used that years ago in my Dakota and loved it. I put down twice the recommended amount though cause personally I thought it was too thin. I believe a gallon is around 40$ and it should have plenty to give you 4-5 decent coatings on the floor. That will eliminate any possibilities of rusting cause of water getting under a mat, it's alot cheaper than line-x/rhino. And probably cheaper than getting a rubber mat your gunna butcher up anyway
That's just my .02