Our popup camper, a Flagstaff by Forest River we’ve owned for about a decade, apparently has a $179.95 part, called a WFCO Converter, whose only purpose is to reduce 120 volt AC current to DC for the use of the camper’s overhead light. Everything else in the camper works on 120 volts AC.
Wish I’d known that before I authorized the repair. I’m guessing we’ll buy our next camper somewhere else.