Food trucks in America aren't exactly designey vehicles; they're all pretty much variations on old ice cream trucks.
Unsurprisingly, Italy—land of both designey vehicles and passionate eaters—won't stand for this form factor. As an example, the Europa line of autonegozi (loosely translated, "shop on wheels," i.e. food truck) sold by Italian manufacturer A.F. Autonegozi are these perfectly rectilinear marvels:
Their design seems to waste not an inch (er, centimeter) of space:
If you're curious to see more, the company posts video walkthroughs on YouTube, but be warned: The video quality's lousy, and the guy holds the camera like he just got off of a storm-tossed boat.