4WD Double Cab Standard Box LTZ - STRONG, REFINED, AND BUILT TO WORK WITHOUT BREAKING A SWEAT—THE 2015 CHEVROLET SILVERADO 2500HD LTZ BRINGS HEAVY DUTY MUSCLE WITH PREMUIM STYLE. DURAMAX DIESEL, HEATED & COOLED FRONT SEATS, BOSE SPEAKER SYSTEM, HEATED STEERING WHEEL, REAR VISION CAMERA, CRUISE CONTROL, AUTO-DIMMING ISRV MIRROR