Water and Power for Winter

We just bought our first RV a class A motorhome. We are about 5 yrs. from retirement but plan on using the home for short trips frequently until then. We will probably use the unit at least once a month for weekends and possible every other weekend for a couple of days until then. My question is we live in SC where the winters get below freezing quite often. I don't want to winterize it so we can just drive off without planning much. How can I keep the tanks and lines from freezing. I keep it in a metal carport with half sides. not enclosed. Can we keep the unit plugged in to power with heat on low, what can we do to not have to winterize. It isn't under sun so solar isn't option to keep batteries charged. Thanks for all help as we are newbies to all this.