When we travelled from Michigan to Florida each January we would leave the trailer winterized until we reached a point South where we could count on it not freezing. That was usually someplace in Georgia or North Florida on the second night.
We would take a couple of gallons jugs of water and keep them in the truck so they wouldn't freeze during the day and use for brushing teeth, making coffee, etc. We would use a bit of antifreeze for flushing the toilet for those midnight visits.
There were a couple of campgrounds that we knew were open on the way down and would usually stay at them. The water was shut off but their restrooms were usually open and heated. They were also usually almost empty so we could most often find a spot right next to or very near the restroom.
This worked very well unless the temps were VERY cold (below 0 deg F) when we would just take a hotel room for the night. We did this routine for about 17 or 18 years until a couple of years ago when we quit traveling.
Barney
2004 Sunnybrook Titan 30FKS TT
Hensley "Arrow" 1400# hitch (Sold)
Not towing now.
Former tow vehicles were 2016 Ram 2500 CTD, 2002 Ford F250, 7.3 PSD, 1997 Ram 2500 5.9 gas engine