I've seen lots of vehicles that display a complete ignorance of aerodynamics, but yesterday I saw one of these trucks on the highway :
The enclosed portion of the truck ( the section behind the cab of the truck ) was mounted
open end first.
He was literally driving a huge parachute !
On the opposite side of the spectrum, the day before, I saw a truck with a prop from a windmill on the trailer much like the one pictured here.
(Probably the best aero the truck will ever have ! )
