I travel in very cold weather all the time. I start out with empty black and gray tanks, add a gallon of non toxic to each to protect the dump valves and drain pipe. I will use the toilet normally, but would flush with some antifreeze.
I try and stop at a CG that has a heated bathhouse with laundry or get a site with full hookups. I use the on board water tank if I need to then re winterize the next morning. no need for me to do dishes due to sandwiches, paper plates, microwave dinners etc. I did it for 3 days once, heading up north instead of south.:h:S
