Painting interior of brand new camper

Coleman sells entry level trailers, there will be a plastic like paper over OSB most likely with the cabinets, the doors may be hardwood. If I were going to do this, I would test the whole procedure where it couldn't be easily seen before going ahead. I have seen this go bad and destroy the value of the trailer. A high end trailer with solid wood cabinets wouldn't be a problem, the OSB if it gets wet enough to swell and separate and even if it appears what is underneath has been covered, it can reappear later especially in the sunlight.

I would consider maybe using a Contact sticky back stuff over the paper/plastic area and walls and just painting the drawer and cabinet fronts.