One warning: Be sure to blow out the dust from your heaters frequently if you have an air compressor. If not, take them apart and wipe out the dust and keep it oiled fairly often. Any build up of dust cuts down on the efficiency of the heaters and creates a big fire hazard. Cat
Bigtim: In cold weather, with three electric heaters, you will be using over 100 kwh per day of electricity. I don't know the local electric rate or how much the camp ground charges you for parking but most places don't allow electric heat even in the more moderate climates. One chart I looked at shows average rate in Colorado of .098/kwh which is almost $10.00 per day for heat alone lus all your other electric use.