DIVCO my dad drove - Edgemar Farms / Santa Monica Dairy Company. (NOT my dad in the pic - another milkman at the dairy.) After the DIVCO, around 1963, he got a dual-wheeled Ford F-450 nose/chassis milk truck.
A favorite comment to when a black swan child was born (a blonde-haired, blue-eyed infant born to a brunette family, for example) was that it was the milkman who did it