Hello RichN. I painted the USAF Blue in the mid 50's. Got out in 1958, and I don't remember any mid or late 50's trucks at Barksdale AFB. That was the old enamal paint we used back then and Lacquer also. You can do better than Air Force Blue - Ha. As I remember the insides were as they came from factory. Unless we had to paint them and it was a "close" color. The early 50's were a brownish or Fawn. Later some of the units they wanted to try a white top to see about reducing heat in the cab for those used on the flight line.
Don't know if that was nation wide or just a local Louisiana thing. This is no help I'm sure - just wanted to jump in. Ha. Get a pretty color that YOU like. ha. Bill Morrison