"No Advance-Design trucks were frame stamped from the factory. Correct? "
Yes, that is correct, Frank50 (except that some people have stated that a code was stamped on the frame by California).
Nonetheless, my DMV inspector (and the main office in Raleigh) maintain that a code was stamped into the frame by GM (on A-D era trucks). I would like to know the experiences of other NC registrants (who successfully registered out of state purchased A-D trucks).