A dark green color was the "standard" (Regular) color in all Advance-Design years, so I'd bet that most A-D 1 tonners were dark green (Forester Green in 47-52; and, Juniper Green in 53-55).
Some people have observed that the light blue color was more common in southern states (maybe they resulted in cooler interior temperatures?) - Windsor Blue 47-52 and Transport Blue 53-55.
