The 2006 Dodge Ram Mega Cab Dually expands the standard model’s rear wheel track to six-feet, four-inches and offers increased payload capacity as well as more stability when towing large trailers. Powering the Mega Cab Dually is a 5.9-liter Cummins turbodiesel, which makes 610 lb.-ft. of torque at a low 1,600 rpm. A heavy-duty 11.5-inch solid rear axle and longitudinal leaf springs combined with gas-charged monotube shocks are responsible for the majority of the Dodge Ram Mega Cab Dually’s ability to tow large loads.