Some of the plywood in our
Scamp, especially the floor and the box that was made to house the
refrigerator, developed a lot of mold. After getting sick twice after
Scamp trips, I have had to rip out and replace the
fridge box and stripped the vinyl from the floor and treated it.
Just returned from a week long trip and so far no alergy reaction.
Don't know about carpeting on walls and ceiling, but at least it is accessible for cleaning, where the plywood wasn't.
Good luck. Alergies can spoil a vacation. I know.