One other option. Do you park your rig where you have access to shore power? Considering how far South you are, you might want to consider just putting a small space heater inside your unit for the few nights it gets that cold. Of course you would have to remember to turn it on, but as long as your plumbing runs are all inside the coach, that should keep it warm enough to prevent anything from freezing up. I would still drain the fresh and pop the low point drains, but I don' t think I would bother blowing out and all the other tricks for such a warm climate, especially if you are still using the unit semi-regularly.
Up here in Canada where it gets darned cold a heater is all I do for the plumbing in our unheated crawlspace for a 4 season cottage; it almost never dips down below freezing down there even though it's -40 outside (I monitor with a remote sensing thermometer). Sure, I winterize the heck out of our TT, but it does freeze down to the outside temperature. As you state it, your rig should never really freeze, and keeping a little bit of heat in there on the coldest days may be all you need.
ETA - about half the guys giving you advice here live up in Canada where we are pretty rabid about winterizing. I don't think the risk is that severe on the Southern US border...
2011 Jayco X19H (purchased 2015)
2008 Jayco 1007 PUP (purchased new, traded for the X19)
2012 Chev Traverse LT with TP