When winter camping for a weekend, here is what we always do, if its freezing out
Leave the hose in the compartment and don't hook it up at all.
Bring a case of bottled water for coffee and cooking
Keep a bottle of windshield washer fluid in the bathroon for flushing, it doesnt freeze
Shower and wash up at the campground bathroom
Bring plenty of firewood and propane
I have has seasons when we took our old Class A to a january Football game, 4 degrees out. We used the windshield washer fluid all day and never dumped the tank until April
But, then again I don't have that RV anymore so I have no way of knowing if it ever had a problem. I do know that the black tank doesn't stink in the winter.
Steve & Betsy
2017 DYNAMAX Isata 3
Days Camped, Not Enough