in my junkyard ownership days, the D100 was a 1/2 ton, and the D150 was considered a "heavy 1/2 ton".
the 1/4 ton pickups were the imported "little" pickups.
That was always the way the trucks were referred to at the local Dodge dealers as well. Even a Dakota short beds were called 1/2 ton pickups
I believe the Imported long bed D 50 was considered a 1/2 ton as well. I think the Mitsubishi pickup (the D 50) was the only long bed imported small truck offered in the USA. Otherwise, all the import small, short bed trucks were considered as 1/4 ton pickups.
