Best way to winterize yet still use unit in winter?

I don't know the ATL very well but it can't get that cold there.
They say the most boats with cracked blocks are from down south because people didn't need to Winterize!
Blowing out the lines, drain water heater and some AF in the drains should take about 30 min once you have a routine. First winter last year with a camper......in Alaska and this is what I did with no freezing damage.