If it's a Jay Feather it is a laminated floor. Joists are made of aluminum and are bonded to the subfloor and under-layer of plywood. Construction is very lightweight and joists are much smaller than a 2*4, and are not on standard centers (sorry, didn't think to measure when I was redoing my floor. But at least there are some joists, many other brand lightweight trailers have no joists at all (just plywood bonded to styrofoam with metal frame around the edge.
As mentioned above @Scott91370's project has some good pictures and explanation and was a great help when I redid my own floor.
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2011 Jayco X19H (purchased 2015)
2008 Jayco 1007 PUP (purchased new, traded for the X19)
2018 Nissan Titan Midnight Ed.
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