GM CERTIFIED 4WD HIGH COUNTRY DELUXE CREW CAB DUALLY DURAMAX 6.6L TURBO-DIESEL FORWARD COLLISION ALERT LANE DEPARTURE WARNING AUTOMATIC EMERGENCY BRAKING FOLLOWING DISTANCE INDICATOR SAFETY ALERT SEAT REAR CAMERA MIRROR HEAD-UP DISPLAY GOOSENECK/5TH WHEEL PACKAGE HIGH... via vAuto, Inc.