The best-selling car on Earth isn't the Accord, Camry, Focus, or anything else commonly cited. With annual sales consistently approaching a million, the Ford F-series is the easy victor, meaning the best-selling car isn't a car at all.Maybe it shouldn't be counted as one, either, but that depends on whether judgment should rest on what something is or what it's used for. Still think trucks are crude, throwaway tools destined to spend their lives hauling loads of anvils? If so, explain the explosion of five-seat crew cab pickups, the scarcity of cab-less ones, shrinking bed lengths, and the addition of items like rack-and-pinion steering and leather. Come to think of it, how often do you see a pickup with any cargo in its box? Let's take a look at the trucks designed to meet these reshuffled priorities.