My enclosed trailer is about 7 or 8 years old. Its got 3/4 inch pressure treated plywood for a floor....and it never seems to last. The ramp gets wet here and there, and the wood holding the water seemed to be causing lots of rust. So today I decided to rebuild it, not using wood. Once I got the wood off...it was worse than I thought. So after some scraping, sanding and a good coat of POR 15 and a new deck I think it should be good FOREVER. Here are the pictures, let me know what you think.