I wouldn't store directly on the coast. Much too harsh. I have used
Weber Creek/Saratoga Storage
7649 Weber Road, Corpus Christi, TX 78415-9702
and can recommend them for covered storage with electric (run a dehumidifier). 24-hr gated access. Good manager (as of a few years ago). Modern, with money spent on expansion & upgrades.
This storage facility is easily approached from the Interstate and Spur 358 (Padre Island Drive), and, alternately, from US Hwy 77. (Map this). In a bad hurricane, Oso Creek will flood, but there is no place in this city that would better, IMO, as to quick in & out (which is why I used a facility that was on my preferred evacuation route; grab the trailer leaving town).
Any point on the Texas Coastal Bend is easily approached from this location to/from the facility. (Also away from "bad" parts of town, of which there are few).
And, South Texas almost doesn't include San Antonio, it is right on the edge of that region. One may be "in" San'tonio while on N. Loop 1604, but that is not South Texas. The Missions, however, are.
1990 35' Silver Streak Sterling
; 9k GVWR.
2004 DODGE Cummins 305/555; 6-manual; 9k GVWR.
Hensley Arrow. 10-cpm solo, 18-cpm towing
Sold: Silver Streak Model 3411