Originally Posted by speede5
http://www.oldihc.org/ Lots of great info here. I think you are looking at what they called a Travelall.
Another good link, thanks!
And yes, a search on Google for Travelall turned up images of trucks very similar to what I've found.
This one is close, but like I said, the sides of the one I found are solid with just a small oval window in the side.