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Missourimoe,
First note: I don't know specifics about your coach, but I have worked on many and even more boats.
First important advice:
Take an extra week to get back north. Spring will come any month now...
If your water heater has a by-pass system shut off any and all the ways it gets heat, open that and drain the tank.
There should be a drain valve or plug for the potable water tank. Drain that.
There are two ways to winterize the potable system:
1 - Find where the system has a way to suck out of a jug. If it does not have that, close the above drain and use the open fill and pour in several gallons of RV anti-freeze. Now, with the pump on, open every tap until it shows pink. Remember to look at EVERYTHING. This means if you can get water out of it, it better be pink.
2 - Attach a compressed air line regulated to less than about 50psi to the city water feed and open every tap until nothing but air comes out. This is just like above, and everything must blow dry or it may be an expensive fix.
When you think you are done, you are not. You still need to empty the black and gray tanks and pour some anti-freeze into the traps. That will go down into the tanks to protect the dump valves.
If you do not have a by-pass on the water heater, I suggest that you put air in the system first and use that to make it drain faster.
If you are going to use anti-freeze and the water heater does not have a by pass, drain it first anyway and remember that you will have to fill that with the anti-freeze and then get a by-pass installed some time later. Remember that the required quantity of anti-freeze will be increase by the capacity of the water heater. (This is why I often have been paid by owners to install a by-pass.)
Frank
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Welcome to IRV2! We're sure glad you joined the gang! 
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