Commonly called the "Hardbody", the Nissan D21 was one of the most dependable and multi-purpose truck for over a decade. Many were sold as fleet vehicles and later converted to box trucks and flat-beds, while others can be seen pre-running a Baja trail or winning a low-rider contest. Even with this kind of versatility, most were simply work trucks and can still be seen hauling lumber or pool equipment across town. The main reason why these trucks are so tough: Nissan D21 parts. The chassis is made from straight steel panels and boxy styling, suspension was simple and stiff, and the standard power train was a fuel efficient, timing chain-driven 4-cylinder engine mated to a 5-speed transmission. Here's a bit of trivia: in 1993, the Nissan D21 was the first vehicle in the US to use R134A refrigerant.