U.S. built GMC with 16000lb. gvw is a 350 series 2 ton. A U.S. built GMC 450 series 3 ton is rated at 19500lb. gvw. As mentioned, Canadian built trucks had higher gvw ratings, for some reason.
Spanky Hardy Collector Of Fine Old G.M. COE Trucks & Antique Holmes Wreckers