I use rubber mats but then also put a bale of the bedding pellets on top . If you wet them a little they fluff up and then will absorb liquid and dry out solids. It keeps the floor dry and then if I'm useing trailer alot I will pull mats out and clean floor and let it dry before putting mats back in. I have even went in and "picked" it like I would a stall and didn't have to clean it completely out as often. I bought some stuff at Rural King to put on the floor. Its pretty thin and comes in a long roll, (you buy however long you need), it's 4 ft. wide, so I just had to do some figuring how much for a 16ft trailer. I think I ended up getting 28ft, measuring 7ft sections to fit across the trailer with 4 total sections. It isn't very heavy so I can get it in and out by myself. I do pull mats in the winter and clean it all out, then lay a couple of 2x4 on their side and lay the mats on top of them. This way air can get under them if you leave trailer outside where snow and rain blows in. I also would put a bale of shavings or the pellets (unopened) in the nose of the trailer in case I needed to haul something quick to the vet, that way they would be handy.