Off-grid Winter RVing Question

"I've toughed it out heating water for a solar shower bag, opening the gray water dump valve, taking a shower then run outside and dump the bucket before it has a chance to freeze. The rig's water system stays dry. This means hauling water but those collapsible 5 gallon water jugs makes hauling water easy and a couple of 4 gallon Home Depot buckets allow frugal dishwashing and shower. If there's no place to dump gray water you're in a hurt. Toilet has to be the mad dash. Guys have it easier than gals in that department. The issue with heating is air circulation. You have to have some means of moving air around. My choice is the Fantastic Fan Endless Breeze Model. Leave all interior doors open at night. For best effect the fan should be located as close to the ceiling as you can get it and have it blow downward on Lo. Don't expect your refrigerator to work well.