Just did mine on Sunday. Blow out all lines (INCLUDING the black tank flush!) and then run antifreeze throughout the system (again, all lines)
My neighbor just blows out his lines and 2 years ago some residual water left in the rim of the toilet dribbled back down into the foot valve - popped it like it was nothing. In the spring, he watered back up and couldn't figure out why his pump wouldn't shut off until he looked into the bathroom. There was 1/2" of water across the floor from the split foot valve.
Antifreeze is cheap insurance. By blowing out the lines ahead of time, you get 100% antifreeze not a diluted solution.
Helped the neighbor across the cul-de-sac last night do his brand new trailer - we were done in 45 minutes. And that was only because he was learning and making sure he remembered everything.
J.
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My $0.02.... Please feel free to take my comments with a grain of salt
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