I first blow the system out with compressed air. to get all water out of lines, then I take the pick up line off tank and place the tube into antifreeze bottle and run pump till I get a good flow though all taps and toilet. A cup full of antifreeze in each trap and in toilet.
I park the trailer so tires
are on boards so tires
will not rot, I support the corners with the stabilizers, I take battery
inside basement, we take the cushions into the basement, I then cover with a car-cover I found for $5. I then go down and scrape snow off roof if it get to be over a foot or more over the winter.