I haven’t mounted my camper to a trailer yet, but looking ahead I see that there are some rubber vibration dampers that go between the camper and the mounting surface. This will help dampen high frequency vibrations. Regarding the stitch and glue (wood/fiberglass/epoxy composite) construction’s flexibility, it is less “brittle” than pure fiberglass because of its layered construction. Thin layers are able to bend without breaking… The structure is able to bend elastically (without permanent damage) a fair amount, so unless the trailer is bending a significant amount, I believe the stitch and glue construction should be more forgiving than a fiberglass shell. I base my belief on my experience with my composite boat structures and also happen  to be a structural analyst in my day job…