we tow a 45' 3 axle 5th wheel race car trailer around with a 2003 dodge 3500 crewcab dually diesel.with the trailer fully loaded down we average about 15-17mpg and will pull both so. calif grades " cajon pass & grapevine" with ease at about 55mph.this dodge 3500 is just awesome anyway you think about it.the cummins 5 valve 6cyl motor is just unbelievable it's got so much torque it's unreal. if you are looking for a diesel truck go with that but stay away from the ford powerstrokes
they have alot of problems.i'm a medium duty/hvy duty diesel mechanic and have done alot of service calls on powerstroke equipped trucks.they have computer problem and the biggest problem is the oiling system .they are known to seize wrist pins and there injectors are run off oil pressure. have you seen the cummins connecting rods they're "huge" and dwarf both the duramax and powerstroke.just go to the turbo diesel registery and find out.
