The Chevy Silverado is General Motor's bestselling vehicle and the second bestselling vehicle in the US. In 2007, the Silverado 1500 received the Classic tag at the end of its name. Silverado shares the same design platform as the GMC Sierra. It is available in three body styles, in two-wheel and four-wheel-drive versions, as well as in regular, extended and crew cab models. The truck is offered in three cab styles, three bed lengths and five trim levels: Work Truck, base-model SL, mid-grade SLE (two subsets: SLE1 and SLE2), luxury SLT and full-boat Denali.