Experience The Diamond Difference. If you're looking for a vehicle that delivers on performance, utility, comfort, or value, this 2020 GMC Sierra 3500HD AT4 may be just the ticket... Vehicle Highlights: Driver Alert Package IPerimeter LightingUltrasonic Front and Rear Park AssistRear Cross Traffic AlertLane Change Alert with Side Blind Zone AlertDriver Alert Package II ($645 value)Safety Alert SeatIntelliBeam Automatic High Beam On/offFollowing Distance IndicatorForward Collision AlertLane Departure WarningAutomatic Emergency BrakingAT4 Premium Package ($3,465 value)20" 6-Spoke Bright Machined Aluminum Wheels6" Rectangular Black Tubular Assist StepsTechnology Package ($2,125 value)Auto-Dimming Inside Rearview Mirror with Camera8" Driver Information CenterMulticolor 15" Diagonal Head-Up DisplayBed View CameraHD Surround Vision with 2 Trailer View Camera ProvisionsPreferred Equipment Group 4SBAll-Weather Floor Liners with AT4 LogoGMC Connected Access CapablePower Front Passenger Windows with Express Up/downPower Rear Windows with Express DownDeep-Tinted GlassKeyless Open and StartPower Door LocksPower Front Windows with Driver Express Up/downRear Wheelhouse LinersRemote Vehicle Starter SystemElectric Rear-Window DefoggerSpray-On Pickup Bed Liner with AT4 LogoCompass Located in Instrument ClusterFloor-Mounted Center ConsolePainted Black Surround Grille with High Gloss Black MeshIntegrated Trailer Brake ControllerHeated Driver and Front Outboard Passenger Seats2nd Row Heated Outboard Seats120-Volt Bed Mounted Power Outlet120-Volt Instrument Panel Power Outlet12-Volt Rear Auxiliary Power OutletVentilated Driver and Front Passenger Seats2 USB Ports Inside Console2 USB Ports (first Row)Electrical Lock Control Steering ColumnManual Tilt-Wheel/telescoping Steering Column2-Speed Active Transfer CaseProGrade Trailering System4.2" Diagonal Color Display Driver Info CenterOnStar and GMC Connected Services CapableLED Cargo Area LightingRed Recovery HooksSteering Wheel Audio Controls2nd Row Dual USB Charge-Only PortsUnauthorized Entry Theft-Deterrent SystemHD Rear Vision Camera4G LTE Wi-Fi Hotspot CapableX31 Off-Road PackageGooseneck/5th Wheel Package ($545 value)Gooseneck/5th Wheel Prep PackageAT4 Preferred PackagePower Sliding Rear Window with DefoggerAM/FM Stereo with Premium GMC Infotainment System and NavigationWireless ChargingLED Smoked Amber Roof Marker LampsUniversal Home RemoteBose Premium 7 Speaker Sound SystemSnow Plow Prep/camper Package ($380 value)Dual 220-Amps Primary and 170-Amps Auxiliary AlternatorsSkid Plates Safety and Security Forward collision mitigation - Forward thinking. You look away for just a second and suddenly the vehicle in front of you has stopped. That's when the forward collision mitigation system comes to life. When it senses an impending impact, it will activate a combination of features to help prevent or reduce the severity of an accident. Forward collision mitigation is always looking ahead. Rear camera - Watching your back! The rear camera helps you see obstacles and hazards you otherwise couldn't by showing enhanced images of what is behind you. The rear camera is an extra set of eyes that's both convenient and safe. Rear camera - Watching your back! The rear camera helps you see obstacles and hazards you otherwise couldn't by showing enhanced images of what is behind you. The rear camera is an extra set of eyes that's both convenient and safe.Technology and Telematics Smart device mirroring - Smartphone, meet smart car. You can control your device through your vehicle's infotainment system. Smart device mirroring brings together safety and convenience by making it easier to find what you're looking for while keeping your eyes on the road. Mobile hotspot - WiFi on the fly. Connect your devices to the Internet through your vehicles private mobile hotspot and take the internet wherever your journey takes you, without eating up your data allowance. Find the hotspot with mobile hotspot. Other Options/Fea