Grigg -- Not sure about the earlier years, but
here's a photo of Jim Carter's restored '46 factory 1-ton DRW express I took at the All Truck Nats last September. Mike Taylor took me for a ride in it to a suitable photo op location and it is a really neat truck.
If any one is interested, I will post the other images I took of the truck that day that show the unique fenders and running boards. Other than that (and the axle ... ), all the other pieces seemed to be the same as the "normal" 1-ton express.
John