Thanks, AZ! My inverter/charger is a 2K watt 2015 Magnum which I guess is a pretty good unit capable of maintaining 4 GC-2s. As I've started looking around, there are quite a few things on the Winnebago that are silently stealing 12 volts non-stop. I think I will start by replacing the 12 volt batteries with 2 GC-2s in series and see if that delivers what I want, adding 2 more if necessary. As long as I get through one night, I don't mind running the generator in the daytime to recharge for the next night. Hadn't thought about a small genny just for battery recharging. Great idea!