I can't remember offhand I think it's 14 feet x 72 inches, It was a bit of a bearcat getting the floor off, as on the original highway refer van, as they are manufactured, the corrugated aluminum flooring is mounted to hardwood cross-members then those are bolted to the steel trailer cross-members making up the floor of the trailer, then when it is all sandwiched together. It is then urethane foamed about 6 inches thick for insulation purposes. but once all separated and cleaned up, cut to fit ( as one piece) and screwed down, it should make a long lasting, maintenance free deck that won't rust, is unbelievably strong. and well, it looks pretty cool as well. I found that trailer to be a good candidate, is it is heavily built, all the wiring is run inside the tubing frames, so there is very very little exposure to the elements, and well,, I got a good deal on it.
Adding up the costs on the total re-furbishment I think I am close to probably the price of a new wooden decked one, but I now know what I've got and it should still be around when some of the other ones have lived out their day
Cheers
Roger