Fiberglass filings on camper floor

[DQDick]

I'm assuming you mean insects that eat foam or fiberglass, not to my knowledge. You haven't parked near a nuclear reactor lately have you? Sorry couldn't resist that. The only thing I can think of is that maybe you have a rodent making a nest. Several folks have reported problems with rodents in the space between the ceiling and the roof. Others may be along with other ideas.