The second in line of Dodge's full-size trucks, the Ram 2500 has a payload capacity of three-quarters of a ton. This is thanks in part to its stronger axles and low gearing in the transmissions and differentials offered for this model. First generations of this truck were wildly popular due mostly to the innovative and surprising new design that debuted in 1994. Sales slowed a few years later, but another redesign boosted sales again in 2002. But arguably the best thing about this truck is the 5.9L 6-cylinder Cummins diesel engine. It was not available on the 1500, so you had to buy a 2500 or higher to get it. Fun fact: there were a limited few light-duty Ram 2500 models with the same transmissions and axles offered on the 1500, but with the Cummins diesel or Magnum V10 engine. Because of this rare configuration, buying light-duty Dodge Ram 2500 parts can be tricky.