2018 Ram 1500 Big Horn
I travel for work and lately I have been driving there though most of the time I am only there for 24/36 hours tops.There are levels of winterized fuel. On the pumps it is rated by temperature. For example in Minnesota right now the fuel is good down to -40. In south Texas you probably do not need that level of protection. The impact of winterized diesel will be less for you in Texas.
They also vary the level of winterized fuel by the time of the year. Three months ago Minnesota did not need -40 protection, so it was -20.
When I travel and change climates it is my policy to get the tank low and fill up in the climate I plan to be in. It would be a very bad idea to have a tank full of south Texas diesel in North Dakota right now.
That sounds like a great idea to keep n mind though if I am coming from a colder climate I don't think it matters as much.