The most popular used dually diesel trucks on the market include the Ford F-350, Chevrolet Silverado 3500 and Dodge Ram 3500. While specifications vary from truck to truck and from year to year, these three models have consistently been popular as used models for many years, as of 2015.
Dually trucks are differentiated from standard pickups by an additional set of rear wheels to enable better weight distribution and traction. These two additional wheels are attached to a single rear axle rather than a second distinct rear axle, as on some commercial trucks. Some dually-style trucks drive both the rear wheels and front wheels using a four-wheel drive system, while others only drive the rear wheels. One disadvantage of a dually-style truck is that the additional wheels widen the rear end of the truck and make it difficult to maneuver or park in tight areas.
Dually diesel pickup trucks are usually intended for hauling payloads of over 7,000 pounds or towing payloads in excess of 20,000 pounds, so they are usually equipped with very powerful diesel engines. A typical diesel engine in a late-model example produces between 600 and 800 foot-pounds of peak torque. Many newer engines use turbocharging or supercharging to boost their peak power output even further.