In case you have not seen it, here is an active discussion on 54/55 trucks in which there are a few posts with photos of Australian 54/55 trucks with split windshields (with curved glass).
Tim, I was going to cross refer this thread too,but you beat me to it!
1950 Chevy Advance Design 3100 in Scotland In the Stovebolt Gallery More pix on Flickr. I've definately got this truck thing in my blood ... my DNA sequence has torque settings "Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.