Source: All-New F-600 Super Duty Leads Completely Updated Ford Commercial Vehicle Lineup | Ford Media Center

It suprises me that the Ford Motor Company would introduce a low-GVWR Class 6 version of the Super Duty Pickup Truck and Chassis and Cab.

Historically, Ford has used the “00” designation for their lower GVWR Trucks and the “50” designation for their higher GVWR trucks; such as, for instance- F-100, F-200, and F-300, and F-600 for their lower GVWR models, and F-150, F-250, and F-350 for their higher GVWR models.