I have a Vegas 25.2 with a tankless water heater so I don't have to worry about that. I put 30 psi air into the fresh water inlet and open all faucets, one at a time until only air comes out. I then dump the tanks and put 1/2 gallon of the pink stuff in each tank and a bit in each trap. Drive around the block to slosh it around to make sure the dump valves don't freeze. That's all i do, never had a problem.
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