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Old 05-11-2013, 04:08 PM   #1
Junior Member
Join Date: Apr 2013
Posts: 6
Floor Joist or support clarification needed

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.


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Old 05-11-2013, 08:17 PM   #2
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Join Date: Sep 2012
Posts: 4,232
The trailer frame is separate from the floor studs.
Trailer Ibeams run front to back with cross bracing just spaced out for the frame.
Floor studs usually sit along the Ibeams, then have cross studs on 16" centers usually.

Floor is usually OSB sheets with black underbelly weave plastic under them to keep the water out.
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