Where do you get this information from? Three-car garages are quite rare in Texas, and I am struggling to recall if I have ever seen a household use both carports for vehicles. At max, one car is stored in the garage while the other half is used for storage.
My wife is from Texas, and I have other family there. While older houses lack a garage, new houses all have them. It took longer for indoor parking to catch on, but it is common. Though "rednecks" are more likely to use the garage for storage of other things and park outside.
