We used a marine headliner, much like
Scamp uses, but with a shorter nap. It is very light weight, stretches and conforms well to the curves of the trailer, and by design, it does not absorb moisture, odors, resists mold/mildew and stains. I ordered it from a marine store, and used DAP High Heat Headliner spray glue to keep it in place, as the 3M 77 let loose in the Arizona heat.
Good luck with your building project.
Dave & Paula