Sounds like most folks try to keep their campers 70+ degrees over night. I set my thermostat between 50-55 when we turn in at night. We have a blanket on the bed so we don't get cold. No reason to burn all the extra propane and use up the batteries while we are sleeping. Nothing will freeze, and it warms right up in the morning with a little furnace action and help from the sunshine. I get a full season out of my two 30# propane tanks, and can make an extended weekend trip without having to start the generator.
Boon docking is the only way to camp.
Becky, Bob and Taylie & Bode
2009 Silverado 2500HD Duramax/Allison
2014 Heartland Sundance XLT 245RL