If you blow out ALL the water lines, drain the water heater, drain the fresh water tank, drain all the waste water tanks, put antifreeze in all drains, you should be OK for the Dallas area. Did I say ALL lines? All lines that can contain water including fresh water lines, clothes washer lines if you have one, dishwasher lines if you have one, ice maker if you have one, black tank flush if you have one, etc. must be drained if you are not going to pump antifreeze thru the lines.
I live near Dallas. Although we do get temps sometimes in the low teens, prolonged temps below 20 are rare. But that is enough to bust a water line if water is still in it.