"DId all Advance Design [Advance-Design] trucks come from the factory with a body tag in the door pillar?"

YES

1948 (1947 would be the same)
1954 (1955-1st would be the same)

"Location : stamped on plate attached to left front [driver's side] body hinge pillar." (between the hinges)

It looks like this location was first used in Advance-Design trucks (1947 model onwards).