The 2015 Chevrolet Silverado 1500 extended cabs come in WT, LT, LS and LTZ trims. The WT comes with 17-inch steel wheels, tinted glass, air-conditioning, cruise control, power door locks, a tilt-only steering column, vinyl seating, rubber floor covering, a 40/20/40-split front bench seat and a four-speaker AM/FM sound system with USB and auxiliary inputs. The LS adds stainless steel finish wheels, chrome bumpers and grille, power and heated mirrors, deep-tinted glass, power windows, keyless entry, Bluetooth phone and audio connectivity, OnStar with 4G LTE WiFi and an upgraded MyLink audio system with a 4.2-inch color display, satellite radio, Pandora radio, a CD player and voice control functionality. Stepping up to the LT adds a chrome grille insert, an "E-Z" lift/lower tailgate, alloy wheels, cloth upholstery, carpeting, a leather-wrapped steering wheel with audio controls, and six speakers for the audio system. The LTZ piles on chrome trim, 18-inch alloy wheels, remote starting, power folding mirrors, a power sliding rear window, a tilt-and-telescoping steering wheel, an auto-dimming rearview mirror, a rearview camera, a 110-volt power outlet, dual-zone automatic climate control, leather upholstery, heated eight-way power driver and passenger front seats with two-way adjustable lumbar, driver seat memory settings and an 8-inch touchscreen display for the MyLink interface.