My historian is Jim Wagner, who wrote GMC Light Duty Trucks as well as GMC Heavy-Duty Trucks, 1927-1987. The first is a very detailed history, with a '56 on the cover, and I have not read the second one. My guess is it is as good as the first. He caught on right quick to the title year vs. year of manufacture issue. I had given him limited info at first, and once I gave him all the details he came right back with '55 titled in '56. I did not want to mention his name without his permission.

Well, my time went so quickly,
I went lickety-splitly
Out to my ol' 55.
As I pulled away slowly,
Feelin' so holy,
God knows, I was feelin' alive..... Tom Waits, Ol' 55