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There's lots of different versions of this story.
I heard they had sand trucks, which are basically the same thing but no salt. They use their trucks to sand bridges and overpasses, like many places use a sand/salt mix.
Maybe we will hear two or three more different versions of this story before it runs it's course.
Bottom Line: They do not get this weather down there often enough for them to be prepared for it. They have not got the materials nor the know-how nor the driving skills to handle something which almost never happens.
If LA or San Diego or Honolulu were to have 2 inches of snow, they would have problems, too.