That would be something good to find out. It seems that with some of the years listed in Barry TT, if it says "1002" ... it's the 2nd truck. One says "10020" and it's the 9019th truck.
Gosh, I had a stack of books here on the table trying to re-do the 41-46 identification web page that spun out into cyber space somewhere.
Maybe we'll go thru a bunch of clear up, clean up, update. Me thinks me has a helper ... soon.
Tell me if you find something concrete ... or asphalt.

Peg