The attached video shows how we put our floor together.
I hope it helps you out.
The laminate flooring I used had a foam under-liner which keeps the laminate off the fiberglass sub-floor (should moisture find its way there), insulates the floor, and provides some flexibility if you are laying the floor over a textured surface. My sub floor has raised dimples embossed in the fiberglass for traction, this was my solution.
‪1986 Boler Camper Modifications‬‏ - YouTube