I was cruising the Gallery last evening looking for those wheels - it seems they were common to Chevy/GMC 3/4 ton trucks from '37-'46 ?
As for Advance-Design 3/4 tons, every one I've seen has had the eight-lug wheels...either 15" or 17" "split" rims.
My '49 GMC 100 (1/2 ton) was the first AD truck I came across that had 6-lug 15" wheels, but these are the later 4-slot wheels.
Every now and then I see folks pulling home-made trailers with these 3/4 ton artillery wheels on them...
