Just make sure your glow plug system is functioning properly and you have a good battery. There is nothing else you really need to do for a TX winter. IF it snows, most counties do not plow or salt the roads. Some use sand but only on main roads. Two years ago we had an ice storm followed by a few inches of snow; the schools and work were closed for an entire week. I was one of the few who can drive in the snow, so I was mostly un-phased by it.

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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
2003 S430 - 107K
1983 300SD - Tanoshii - mostly restored ~400K+.
1983 300SD - Good interior. Engine finally tamed ~250K.
Monark Nozzle Install Video - http://tinyurl.com/ptd2tge