Here's a 1949 picture :
According to the caption, it's a 1945 model.
Same truck with a tarp on and a trailer :
The licence plate has a "F" and a small 3-color flag (blue-white-red) meaning that the truck is registered in the French zone of occupation.
Maybe you can guesstimate the cargo bed length, knowing that the wheelbase is 4600 millimeters :Full size