Sierra 2500 4WD Crew Cab PROX31 OFF-ROAD PACKAGE includes (JHD) Hill Descent Control (NZZ) skid plates Off-Road suspension Twin-tube Rancho shocks and X31 hard badge Includes (QF6) LT275/70R18E all-terrain blackwall tires., REAR AXLE 3.42 RATIO, PRO PREFERRED EQUIPMENT GROUP includes standard equipment, HIGH IDLE SWITCH, ENGINE DURAMAX 6.6L TURBO-DIESEL V8 B20-DIESEL COMPATIBLE (470 hp [350.5 kW] @ 2800 rpm 975 lb-ft of torque [1322 Nm] @ 1600 rpm) Includes (K05) engine block heater.), GOOSENECK / 5TH WHEEL PREP PACKAGE -- HITCH PLATFORM TO ACCEPT GOOSENECK OR 5TH WHEEL HITCH. Includes hitch platform with tray to accept ball stamped bed holes with removable caps installed and bed mounted 7-pin trailer harness (similar to UY2 harness). Includes (JL1) Trailer brake controller and (CGN) spray-on bedliner. Not available with (ZW9) pickup bed delete.), WHEELS 18 (45.7 CM) 8-SPOKE PAINTED STEEL SILVER EXTENDED, 1SA PRO SAFETY PLUS PACKAGE includes (UD7) Rear Park Assist (UFG) Rear Cross Traffic Alert (UKC) Lane Change Alert with Side Blind Zone Alert and (DWI) trailer mirrors, GVWR 11 350 LBS. (5148 KG), TRANSMISSION ALLISON 10-SPEED AUTOMATIC, POWER OUTLET INSTRUMENT PANEL 120-VOLT (400 watts shared with (KC9) bed mounted power outlet), LAMPS SMOKED AMBER ROOF MARKER (LED), CONVENIENCE PACKAGE includes (QT5) EZ Lift power lock and release tailgate (K34) Cruise control (AKO) tinted glass (UF2) LED cargo bed lighting (C49) rear-window defogger and (DBG) outside power-adjustable vertical trailering with heated upper glass, FLOOR COVERING COLOUR-KEYED CARPETING, Tow Hitch, Front Collision Mitigation, Front Collision Warning, Lane Departure Warning, Automatic Highbeams, Running Boards/Side Steps, Locking/Limited Slip Differential, Keyless Start, Four Wheel Drive, Power Steering, Steel Wheels, ABS, Tires - Rear All-Season, Conventional Spare Tire, Tires - Front All-Season, 4-Wheel Disc Brakes, Tow Hooks, Power Windows, Lane Departure Warning, Daytime Running Lights, Auxiliary Audio Input, Power Windows, Floor Mats, Front Collision Mitigation, Passenger Air Bag Sensor, Smart Device Integration, Driver Restriction Features, Stability Control, Power Outlet, Telematics, Daytime Running Lights, Requires Subscription, Daytime Running Lights, Power Door Locks, Passenger Air Bag, Auxiliary Audio Input, Telematics, Front Collision Mitigation, Rear Bench Seat, Front Collision Warning, Pass-Through Rear Seat, WiFi Hotspot, Front Head Air Bag, Power Door Locks, Traction Control, Driver Air Bag, Front Side Air Bag, Requires Subscription, MP3 Capability, Bluetooth Connection, Smart Device Integration, Back-Up Camera, Tire Pressure Monitor, Bluetooth Connection, Automatic Highbeams, Power Windows, Smart Device Integration, AM/FM Stereo, A/C, Bluetooth Connection, MP3 Capability, Vinyl Seats, Rear Head Air Bag, Keyless Entry, Split Bench Seat, Front Collision Warning, Bluetooth Connection