Actually, I just checked their docs online and the Mr Heater Buddy series are suitable for use in the camper. They are one of the few that is. You need to provide suitable ventilation, but they are safe for use indoors.
Here's what they say:
"Emergency Heat, Tents, Campers, Workshops, Job Sites, Porches, Patios, Decks, Garages, Storage Buildings, Picnics, Tailgate Parties, Construction Trailers, Sporting Events, Barns, Sheds, Hunting Blinds, Shelters, Ice Fishing Shanties"
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