So far, I have received the following information about the dynacornbodies cabs/parts:
1. 1947-50 cab, TR47 (most likely has the earlier door but no confirmation about the driver's side air vent).
2. 1951-1954 (they said 1954), TR52 (most likely has doors set-up for vent windows)
I asked for clarification regarding 1954 have a one-piece windshield and a different dash from earlier years. I also asked if they sold the 1954 dash as a part.
I'll post the information when I get it.