We have two 1500 watt electric space heaters that we've used in the past. Because they are on the same breaker when in use, I run in both at low setting, which is 750 watts, so I don't blow a fuse. Actually, I found that we can get by with just one at night. We used it to supplement the furnace if we wanted to save propane since the electricity was already paid for on our campsite. Perhaps you would have a better peace of mind if you ran a portable electrical appliance versus a portable propane appliance in the camper at night. Just make sure your propane, carbon monoxide and smoke detectors are up to snuff.
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"Stateboy" (Formerly "36fire412")
SW Lower Michigan
2012 Toyota Tundra Crewmax TRD 4x4