Well I just bought an 89 Coleman Newport (paid a whole $200 for it but it needs recanvasing) and as I'm trying to introduce my wife and kids to camping (she has never been and freaks out from the most minor inconveniences) and I don't want her first experience to be a disaster. One big concern will be staying warm while conserving power at the same time. From the efficiency point of view it seems to me that heating mattress pads might be one of the best ways to keep warm at night and not use a whole lot of power, but do I'm not finding the ones that are meant for 12 V use, only the regular 110V home use ones. Is that what people use in their PU? I'm also thinking about getting maybe a Mr. Heater or some other small heater.