Fumblin, the type descriptions are still shifted for the '53-'55.1. Here's a correct list:
3100 H 1/2 Ton - Comm. 116"
3600 J 3/4 Ton - Comm. 125.25"
3700 K 3/4 Ton - Forward Control 125.25"
3800 L 1 Ton - Comm. 137"
3900 M 1 Ton - Forward Control 137"
4100 N 1-1/2 Ton 137"
4400 P 1-1/2 Ton 161"
4500 R 1-1/2 Ton - School Bus Chassis 161"
5100 S 2 Ton COE 110"
5400 T 2 Ton COE 134"
5700 U 2 Ton COE 158"
6100 V 2 Ton 137"
6400 W 2 Ton 161"
6500 X 2 Ton 179"
6700 Y 2 Ton - School Bus Chassis 199"
6800 Z 2 Ton - School Bus Chassis 212"
The AD trucks also had what they called 1-1/2 Ton Specials in the 5000 and 6000 series that aren't included in this list. These are identical to the 2 Ton trucks, but use lower rated tires and include a "derated" max. GVW VIN plate. I could elaborate if you would like to include them. It adds an S to the series prefixes to end up with a 3-letter prefix for '47.2-'52, and 2-letter for '53-'55.1. I don't know how many of these "Specials" are actually out there.
