We use two oil-filled type heaters. Never got use to the idea of having a red hot visible core or burnt dust smell. Would not leave one of those going unattended with pets or kids around for sure...
If we need to move some more warm around we just sit one of the O2COOL 10-inch fans behind the radiator of the oil-filled heater.
Always better to use the camp ground electric instead of your propane anytime... I usually run as extension cord in from the pedestal 20AMP connection when using the portable electric heaters... I also never crank up the electric heater above the #3 setting on my heaters. Not a good idea to really heat up the 120VAC plug on those things...
Roy Ken