Orchid, Heated mattress pads are the way to go; as the heat goes up under you. Unlike an electric blanket; as the heat goes up and above you. Like this one: heated mattress pads I have used them here in Ontario Canada, in the fall. With a ceramic heater like this one. ceramic heater One ceramic heater on 'high' runs about 12.5 amps. So two heaters on 'high' will trip a 15 amp breaker. Two heaters on the 'low' setting may not trip a 15 amp breaker as each heater is about 6.25 amps each. BTW: most campgrounds are closed for the season here. Good luck and happy camping.