I just redecked my snowmobile trailer. I did a bit of research and ended up using 3/4" Marine grade plywood primed with a 3-2-1 Primer and painted with Waterproof Behr solid stain. A lot of research i found recommended products like Behr Deck over or Rustoleum 2x deck paint etc. I have had much bad experience with these types of 'paint' on wood as they tend to peal up and flake off. Knowing that I would have tracks and skis sliding across the wood I opted for the route I did. I can't say it will be much stronger if any but if it adheres I will be happy. So far this season I have spun track enough to leave rubber on it without any sign of pealing or even wear just rubber. So I am happy so far. Also want to mention 3/4" is pretty stout so consider your spans on the frame might be able to go with a 5/8" or maybe even 1/2" oh and Marine grade is expensive... at least in 4x10.. so if your deck is 10' long something to consider.
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