PACKAGE X31 Off-Road Package includes (JHD) Hill Descent Control, (NZZ) skid plates, Off-Road suspension and Twin-tube Rancho shocks ProGrade Trailering System includes (PZ8) Hitch Guidance with Hitch View and (UET) In-vehicle Trailering App --- MECHANICAL Rear axle, 3.73 ratio (Requires (L8T) 6.6L V8 gas engine.) Hill Descent Control Transfer case, two-speed active, electronic Autotrac with push button control Cooling, external engine oil cooler Cooling, auxiliary external transmission oil cooler Air filter, heavy-duty Air filtration monitoring Battery, heavy-duty 720 cold-cranking amps/80 Amp-hr maintenance-free with rundown protection and retained accessory power (Included and only available with (L8T) 6.6L V8 gas engine.) Alternator, 170 amps (Requires (L8T) 6.6L V8 gas engine.) Trailer brake controller, integrated In-Vehicle Trailering App, System includes checklist, trailer maintenance reminders, trailer security alerts, trailer mileage, tow/haul reminder, trailer electrical diagnostics and Trailer Tire Pressure Monitor System module (Includes trailer tire pressure monitoring alert when (PTT) trailer tire pressure monitor sensors are installed.) Skid Plates protect the oil pan, front axle and transfer case Frame, fully-boxed, hydroformed front section and a fully-boxed stamped rear section Suspension, Off-Road includes twin-tube shocks Brake lining wear indicator --- EXTERIOR Capless Fuel Fill (Requires (L8T) 6.6L gas V8 engine.) Tire carrier lock keyed cylinder lock that utilizes same key as ignition and door Bumper, front, body-color lower Bumper, rear body-color with bumper CornerSteps Bed Step, Black integrated on forward portion of bed on driver and passenger side CornerStep, rear bumper Cargo tie downs (12), fixed, rated at 500 lbs per corner Wheelhouse liners, rear Moldings, beltline, Black Grille (Gloss Black header and grille insert bars with Black Chrome accents.) Lamps, cargo area cab mounted integrated with center high mount stop lamp, with switch in bank on left side of steering wheel LED Cargo Area Lighting located in cargo bed activated with switch on center switch bank or key fob Taillamps, Animated LED Signature Tail, Stop, turn and Reverse lamps Mirror caps, high gloss Black Door handles, body-color Tailgate, gate function manual with EZ Lift includes power lock and release, includes hitch area light Tailgate and bed rail protection caps, top --- INTERIOR Center Console, floor-mounted with cup holders, cell phone storage, power cord management, hanging file folder capability Floor covering, color-keyed carpeting Steering wheel, wrapped Driver Information Center, enhanced, 12.3" diagonal reconfigurable multicolor digital display Rear Seat Reminder GMC Premium information Display- 13.4" diagonal Multicolor touch screen Exterior Temperature Display, located in radio display Compass, located in instrument cluster Wireless Charging Power outlet, instrument panel, 120-volt (400 watts shared with (KC9) bed mounted power outlet) USB ports, (2) charge-only, rear Power outlet, bed mounted, 120-volt (400 watts shared with (KI4) instrument panel mounted power outlet) Air vents, rear Assist handles front A-pillar mounted for driver and passenger, rear B-pillar mounted GMC Connected Access capable (Subject to terms. See onstar.com or dealer for details.) --- SAFETY Bed View Camera, camera in the CHMSL to show a view of the cargo bed display located in infotainment screen, includes Two Trailer Camera Provisions Trailer Camera Provisions and trailer viewing software Hitch Guidance dynamic single line to aid in truck trailer alignment for hitching Following Distance Indicator (Included and only available with (PDI) Sierra HD Pro Safety.) Rear Seat Belt Indicator Seat Belt Adjustable Guide Loops, front row only Buckle to Drive prevents vehicle from being shifted out of Park until driver seat belt is fastened; times out after 2