All have slightly different road number specific detail
Body phase per prototype
Hyatt axle bearing caps
Is an early phase 3 unit with 36” radiator fans and forward fuel fill, dynamic brakes, 3-pane winter window, five-step stepwells, cab roof mounted horn, antenna, beacon, and narrow nose stripes.
The oldest of the bunch, is a phase 2 with dynamic brakes and a plow pilot. It also has the five-step stepwells, winter window, modified side sill, rear mounted fuel fill, cab roof mounted horn, antenna and beacon.
Torpedo boat with big fuel tanks and the air tanks moved to the roof. We still have the standard 3-pane all weather cab window, 5-step stepwells, cab roof mounted beacon, antenna, air horn and a modified side sill, but no dynamic brakes.
A standard early phase 3 unit with dynamic brake, forward fuel fill, 5-step stepwells, 3-pane all weather cab window, cab roof mounted beacon, horn, antenna and narrow stripes on the nose