You're on the right track but in my opinion, once you have it parked for the winter, leave it parked. Starting and stoping equipment in winter conditions is never good.
The problem you are going to run into is with the batteries. As long as they are charged, they will not freeze. So, how to maintain the charge?
The best way is to keep the coach plugged in if that is possible. A standard 20A service will do the trick as long as all the other appliances are turned off. This will allow the converter to maintain the batteries.
If you don't have this option, the next best thing is to install a battery cutoff switch on the negative post of the house and chassis batteries so you can completely isolate the batteries. Without a disconnect, there are some parasitic loads that will stay on and drain the batteries within a few days.
Now, if you do choose to run the generator, you can switch the batteries on very easily. I suggest you run it for a Minimum of two hours with as much load as you can turn on. An electric heater or two would help in this regard.
The idea here is to remove any moisture in the windings. In order to do that, it needs to run long enough to heat up and dissipate the condensation you generated by starting it. Otherwise, you do more damage than good.
If it were me, I would take my digital voltmeter and check the battery voltage on a monthly basis and only start the generator if the battery voltage falls to 12.0 volts. You do not want to allow the voltage to drop below 12.0 volts.
Keep an eye on the electrolyte levels and If you need to top off the cells, make sure you run the generator for a longer period to allow the water to change into electrolyte and thus won't freeze.
There is one more option and that is to remove the batteries and store them at home with a trickle charger. For me, that would be the last resort. But, some do exactly that.
Hope this helps,
Dennis & Carol
2003, 4006, 41' DutchStar,
Spartan, ISC 8.3L W/BanksPower - 2013 Honda CRV, BlueOx Baseplate, Aventa Bar & Patriot Brake. And the 04 Bird, Sunshine Car.