I am doing a similar trip almost every year. I do not carry any fresh water in the tank with me, but use bottled water for the trip (those 1gal jugs). I use the blue windshield wiper stuff to flush the toilet manually and add the same amount of pink stuff as the water I run down the sinks. I just don't want to take the risk, because some of the water lines are running along the outside walls and don't get much of the heat inside the coach. In addition, I do not want my waste valves to freeze shut on me.
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