When you go to replace the floor, you should consider Rubber composite plastic or Durock cement board. They will not rot from the moisture.
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SO GLAD you mentioned these options. Don't know WHY I didn't think of them--my father was in the plastics industry and tried to push plastic coated wood, but the industry wasn't ready for it back in the 1980's.
A friend helped us to replace the floor of my previous trailer.
This is just a GREAT example of the worth of removing or at least, rolling up your mats when you are not trailering. My trailer lives in my back yard and I remove the mats when not in use. I line the aisle of my 3 stall barn with them, so I don't have to look for them when it's time to trailer again.