1994 with the last generation of trucks.
the days are gone of all the variations of trucks used to be ther was 1/2 ton, heavy half (5/8), 3/4, HD 3/4, 1 ton, and 1ton dually
Nowadays they seem to be making just three 1/2 (the old 5/8), 3/4 (the old HD3/4) and 1 ton (dually). but added the 4 door models and short boxes on 3/4 and 1 tons plus they seem to going "bigger" on the trucks 1 1/4, 1 1/2 ton trucks on pick-up bodies.