I have plenty of wood at my disposal. 2x4,2x6,and plywood sheets. With it being a lightweight trailer what would be the adverse effects of adding that much weight? I'd also like to put some really nice old hardwood that I scavenged down and finish it. This foam will not cut it. Too many spots it flexes as you walk over it as if it is broken. I'm willing to get off the hardwood wagon if I have to... I just have a lot pictured in my mind that I want to do to renovate it to make it really nice. The specs say the trailer is around 4000lbs with 400 or so on the hitch.