It depends on the season down in the Rio Grande Valley. In the winter months, we are covered up with crew cab dually 4x4 diesels. We have lots of senile dementia patients that buy the darned things to pull thier fifth wheel to the valley and back each year, most have never gotton off the blacktop, and never will (gets them dirty). I am convinced that in trying to spend their money before they die, they go to the dealer and simply believe that the more you can spend, the better you get. The 4X4 stuff costs, so it must be better for the highway, and besides, the 4x4 stickers look cool.
They use them for cars during the winter, so parking lots are clogged with the darned things taking up three spaces, and you learn never to park close to one, since they don't know how to drive them either, except by contact parking. .
When the summer gets here, diesels are rare, two wheel drive gassers are everywhere.