[pritch]

Mine is clearly, obviously plywood. From underneath you can see just one joint, 2 sheets. Also, I can see the edge of it around the wheel wells. Looks like really good plywood, but definatly plywood. Actually, it probably would be easier to replace it with planks. There don't seem to be any difference in how they would be held in place, between trucks and panels, except at each end where the wood kinda tucks under the metal. Gosh, now my mind is running wild with the thought of sandwiching some insulation between some planks. Maybe 3/8" plank, 3/8" of insulation and then 3/8" of plank glued and screwed together. That would be 1 &1/8" thick overall, I'd just have to trim down the ends a little to get under the metal at the ends. Oh well, I have clear 'till phase three to think about it.