A gallon of RV antifreeze is a must and I am sure you can find a small electric heater that will turn on when the temp falls below 34 degrees or so... like the previous response never leave the tanks open. Well at least the black. I always like to have at least 1/2 take of gray water so when I dumb the black take I have enough gray water to flush out all the poops.
Hope that helps
-Brad
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