I have my Class C connected to power when being stored all winter. I do not start the engine or move the RV until spring, and the skiing is over. Where it's stored, it is blocked in by snow most of the winter, most winters.
I have a Battery Minder on the house battery and a trickle charger on the chassis battery. I don't use the converter during storage. I start the generator every couple of months during a warm spell.
Of course I winterize the RV in the fall before it freezes and de-winterize in the spring.