I had that happen to me as well. When I got done driving for the day the carpet was soaked and filthy from road sludge. I cut the carpet out that evening and it was probably a good thing that I did. The floor was also soaked. I soaked up as much water as I could with towels and put a fan on it overnight.
After the floor had dried out I put down a wood floor, and added a D shaped gasket with the wiper seal to the bottom of the slide out. All you need is the D shaped gasket if your slideout seals while opened. In my case it didnt even have a seal so I needed the wiper to seal it when open and the D to seal it when shut.
