Winterizing Rig

If you are living in the rig and of course using the furnace.........are there any precautions that need to be taken to keep everything from freezing? I know to unhook the fresh water hose.......but doesn't the furnace keep all else from freezing? Thanks,

Your correct, We have a a fresh water hose that has a heat tape on it and it is wrapped with 1/2" foam insulation and duct tape. The insulation will keep it from freezing on night that drop just below freezing. The heat tape can be used on very cold nights. if it is going to be below freezing for several days, we can fill the fresh tank and turn on the tank heaters to supplement the heat from the furnace. and be good until we run out of propane.