Fill up the gas tank before putting it up for the winter. The less air space there is in the gas tank, the less chance for condensation and water in the gas.
Other than that, it sounds like you have things pretty well under control. Running the generator for a spell (under some load, such as a space heater) every month or so is a wise idea. If you're due for an oil change, it makes sense to do it before storage rather than afterwards so that you have fresh oil rather than possibly contaminated oil.
If you don't have power available where you're storing the RV, charge the batteries fully and then disconnect them and leave them be. If left connected, the parasitic loads (particularly on the house batteries) will probably be sufficient to run them down completely and sitting discharged will damage them. If you can leave it plugged in, at least sporadically, the converter will keep the house battery charged.
