That's one aspect of Derek's character that I just don't get. They present him as this rather hoity-toity preppy guy. He comes from a somewhat well-off family that has produced a boatload of doctors. He was married to a woman that we know from Private Practice came from a pedigree background. Everything about him says "Ivy league, country club type". And yet, they have him driving this rustic military-like vehicle with a spare tire on the hood, living in a camper. Something there just doesn't work for me.