I found this post from Ford Vehicle Capsule Reviews to be pretty informative:
No one suspected the Super Duty F-350 DRW to be a hit in 2001. Pitted against its chief rivals, the Super Duty F-350 DRW makes for a better all-around 2WD Light Duty Chassis-Cab Trucks. Ford’s first try at this didn’t go over too well with this audience,

Found at: Ford Vehicle Capsule Reviews