traveling in a 5'ver at below 32 degrees

We've been camping for almost a decade in our Class C whose tanks are out in the cold. Asothers have said, we start winterized; and as we drove south, we flush with antifreeze. Also add af to the gray tank if we run any water down the sink. When we're certain we'll not have below-freezing temps at night, we'll go ahead and use regular water. As we head back north, we'll winterize when needed, then use the same pink-flush method.

We also use Reflectix cut to fit the windows; styro vent blocks; and a heavy quilt to separate the non-insulated driver's area from the rest of the mh. We've stayed warm enough using an electric heater, and use the campgrounds shower.