We have been hauling bikes in trailers since the mid 70's. Mostly motocross but street bikes on rare occasions. There is always the temptation to make your trailer "pretty" and we have fallen into that mindset on a trailer or two. NEVER again.
Advice from someone who has been doing this for decades. For the floor, forget pretty. Plain plywood is a great way to go. It's pretty much anti-skid, even when it's wet or when your boots are wet. You won't faint if you drop something heavy on it and you won't get pissed off at yourself or your buddy if you or he he accidentally scratches the **** out of it. From my experience plain plywood is far better than your pretty floor trailer, be it vinyl tile (with the BORING black and white checkerboard you see on the NASCAR wannabe guy's trailer), rino type sprays (stupid expensive), and paint/coatings of all and any type.
In my humble opinion a pretty trailer floor is pretty stupid, from a practical and safety standpoint.