The Chevrolet Silverado is a line of full-size and medium-duty pickup trucks introduced by General Motors for the 1999 model year, serving as the successor to the Chevrolet C/K series and taking its name from that line's top trim level. Mechanically sharing its platform with the GMC Sierra, the Silverado competes with the Ford F-150, Ram, Toyota Tundra, and Nissan Titan, solidifying its status as one of America's best-sellers with over 12 million trucks sold since 1998. The Silverado nameplate originally debuted in 1975 as a premium trim package for the C/K, evolving into a standalone model line that has seen four generations, with the newest arriving for 2019. A notable expansion came in 2018 when Chevrolet entered the medium-duty market, unveiling the 4500HD, 5500HD, and 6500HD chassis cabs, which are also rebadged by partner Navistar International as the International CV. While sharing its basic architecture with the GMC Sierra, the Silverado has a distinct history, having maintained the C/K nomenclature longer than its corporate sibling before adopting the Silverado name.