We are only 4 hours from myrtle beach, just north of Charlotte. The coldest time for us is in the morning just before dawn. That's normally the coldest point. We are originally from Augusta, Georgia and you and I both know that the weather is unpredictable. It could be freezing at Christmas this year or you could be wearing shorts. Growing up in Augusta, I remember temps between 0 to 10 degrees happening every year at one time or another. Winterizing, if or/and when, down here in the south is a matter of preference. We personally prefer to do it. But that doesn't mean we can't use our motorhome. We just go to someplace that has a bath house and try to park somewhere near it. Just as we would at ocean lakes there in myrtle beach. We just do not use any of the plumbing in the RV while there. Leave it all to the bath house.
My sister and her husband live south of Atlanta. Years ago they had a camper and her husband blew out the lines. He thought he got all the water out. Thought that is. Come that winter, he had some repairs to do. If you don't winterize, you are only playing against the odds.