The '49 movie describes many of the first major set of changes to Advance-Design trucks, and the '54 movies describes many of last major changes to Advance-Design trucks.
I did not clean-up the noise in the old recordings. Young people might not have heard what old LP records sounded like after they were played many time on cheap record players.
Besides being interesting, the slides posted above, and those posted by Brad and by others, contain original photographs, not artists interpretations/illustrations (B/W photos, unfortunately). These slides/photos still provide a lot of information about where accessories were installed and where paint transitions were made.
