Oh, missed that, sorry. Still, the high roof, heavy duty version reviewed by C&D is almost two feet taller and 600# heavier than the 1500. That height especially has to kill the fuel mileage. MotorWeek rates the 4-liter standard roof 2500 at 16.8 mpg - no Prius, but not *so* bad for a truck.

Would a pickup with a tall cap meet your needs?