well, driver, the first production breakdowns aren't available for GM trucks before about the 67-72 models, so it's hard to say how many were produced - aside from the difference in 8 years for the AD and 5 years for the TF, there's no reason except there's just lotsa people [here anyway] who prefer the fat fendered ol bubble bodies of the earlier years - there seem to be more around here, but surely not "everyone" owns them!
you might find more later years
at the burb site Bill
