The VIN number on these trucks are located in 3 easily visible places.  Those places are, top of the driver's side frame rail, anywhere from the steering mount area to the shock mounting area.  Next is on the rating plate on the inside of the glove box door, and third is top of the bellhousing, viewable when the transmission plate is removed from the floor.  Most reliable is the number stamped on the frame, second the glove box door (since the plate is easily removed) and 3rd is the bellhousing since transmissions are often swapped out.  The number on the frame will start with a star shape, the followed by the number, and have a star stamped at the end of the number.

Ford truck VINs prior to the 1946 model year used a prefix that started with 99, then the model letter.  For instance, 99C is a 1/2 ton model, 99T would be a 1.5 ton model.  Only the serial number range can tell us the year from the VIN alone.  Also, the serial numbers also include car production as well.  The 1945 Ford trucks used a V8 only, it was not until 1946 models that the 6 came back.  So this VIN info applies to all 1945 Ford trucks meant for U.S. registration.  I have not yet found a definite source for the range yet.  Although it has to end with 650279 since 1946 V8 production starts with 650280.

1945 Ford trucks had 4 models available, 59C is a 1/2 ton, 59T is a 134" WB, 598T is a 158" WB, and 594T is the 194" WB School Bus Chassis. 

So, here's what the 1945 VINs look like:

99C is a 1/2 ton (example 99Cxxxxxx)

99T is a 1.5 ton (example 99Txxxxxx)