I'm getting closer to getting my first TT. I went and looked at a dealer yesterday, instead of just online data and photos and brochures. I looked for some things I picked up on from this forum, like location of tanks, etc. when looking under the trailers. That's when I noticed most of the travel trailers looked like there was a painted plywood floor, but every one of them only had a crosspiece (what I might call a floor joist, but I don't know if that's the right term in a TT) every 4' or so, sometimes more. There was a good i-beam frame, but no crosspieces except every 3-4' or better. Is that normal? I was reading about the Nash's, that they have "2" X 3" longitudinal joists 16" on center". Does that mean they have supports every 16" down the length of the trailer? If so, wouldn't that make for a much more rugged trailer? I must be missing something. I am looking at the Nash 17k (not in person), as it is the only one in my size category that I can pull with a full 80" Queen size bed, vs the 74.5" long bed in nearly all other models. I was kinda thinking of a Winnebago towable Minnie, but after being unable to find their bed length anywhere online or in print, I called the factory in Indiana, and it took them 2 days to find out that theirs are 74.5" also except for one model, the 2451 I think he said. I called three times trying to find out, and asked them if they couldn't just take a tape measure to the floor and measure the mattress, but they wanted to ask engineers. I guess I got off track. So I am basically just wondering about the floor support thing, and would appreciate any advice.