Mold requires moisture to grow. No water (moisture), no mold. All I'm saying is, some where, some how, water is getting in. And as you described it 'all throughout the camper", and "behind the pimples" rather than on the surface.
My opinion, You got a leak! The adjuster is wrong or just didn't want to level with you. Either that or you just noticed pimples that were there from day 1(or shortly thereafter).
The "contaminated board during construction" argument is pretty weak. I'd bet dollars to donuts you got a leak.
