Picked up an old Thule (I think) trailer that I think was originally a kid-hauler, but has all the fabric removed. Now it's a bare frame. I could carry plenty as is, but I'd like to put some kind of light, weather-proof floor on it capable of supporting my two, 35 pound dogs. I could just seal up a piece of plywood, I expect, or some particle board, but I want to explore my options and make sure I'm not missing a better choice.