At the 1952 wheels and tires link above (and in all Truck Data Books) the 15" wheel was "base" for 3600 trucks and all the wheels had 8 lugs/bolts. It looks like there was one 17" wheel option and three 17" tire options in 1952.
There was an optional 15" 6-bolt wheel for 1/2 ton Chevrolet trucks in all Advance-Design years. The Chevrolet 15" 6-bolt wheel was one piece, and I think the GMC 15" 1/2 ton 6-bolt rim had three pieces.
