I bought a small ceramic heater at wallmart. A Lasko. I got it for my 5th wheel trailer to save propane useing the trailer furnace. Some guys at one of the RV web sites mentioned ceramic heater, so I tried one.

Its only 9x7 inches big. And it works great. It has a fan in it to blow the heat. Only about $18.00

I actually bought 2 different brands at walmart and tryed them out when I got home . The Lasko one worked way beter so i took the other back

It draws some amps though. It works off my honda 2000 generator but the generator revs up pretty good to run it.

Best to have your camper plugged into 110 RV outlet.