4 wheel drivers
Just as I thought. From a book review in the Washington Monthly:
According to market research conducted by the country’s leading automakers, Bradsher reports, [Sport Utility Vehicle] buyers tend to be “insecure and vain. They are frequently nervous about their marriages and uncomfortable about parenthood. They often lack confidence in their driving skills. Above all, they are apt to be self-centered and self-absorbed, with little interest in their neighbors and communities. They are more restless, more sybaritic, and less social than most Americans are. They tend to like fine restaurants a lot more than off-road driving, seldom go to church and have limited interest in doing volunteer work to help others.” [Link from Arts & Letters Daily].