Certified. 2021 GMC SLT Sierra 1500 This vehicle Contains the following features and options: Max Trailering Package (220 Amp Alternator 3.42 Rear Axle Ratio wMax Trailering Pkg Enhanced Cooling Radiator Heavier Duty Rear Springs and Increased RGAWR) SLT Convenience Package (2 USB Ports 2 USB Ports (1st Row) Floor-Mounted Center Console Front Bucket Seats Heated 2nd Row Outboard Seats Power Sliding Rear Window wRear Defogger Universal Home Remote and Ventilated Driver & Front Passenger Seats) SLT Premium Package (20 x 9 Polished Aluminum Wheels and Chrome Wheel To Wheel Assist Steps) Trailering Package (Hitch Guidance) 10-Way Power Driver Seat Adjuster wLumbar 10-Way Power Passenger Seat Adjuster wLumbar 12-Volt Rear Auxiliary Power Outlet 120-Volt Bed Mounted Power Outlet 120-Volt Instrument Panel Power Outlet 170 Amp Alternator 4-Wheel Disc Brakes 4G LTE Wi-Fi Hotspot Capable 6 Speakers 6-Speaker Audio System Feature ABS brakes Air Conditioning Alloy wheels AMFM radio: SiriusXM with 360L AppLinkApple CarPlay and Android Auto Auto-dimming door mirrors Auto-dimming Rear-View mirror Auto-Locking Rear Differential Automatic temperature control Auxiliary External Transmission Oil Cooler Brake assist Bumpers: chrome Chrome Grille Color-Keyed Carpeting Floor Covering Compass Deep-Tinted Glass Delay-off headlights Driver door bin Driver Memory Driver vanity mirror Dual front impact airbags Dual front side impact airbags Electric Rear-Window Defogger Electrical Lock Control Steering Column Electronic Stability Control Front 402040 Split-Bench Seat Front anti-roll bar Front Center Armrest wStorage Front dual zone AC Front fog lights Front Frame-Mounted Black Recovery Hooks Front reading lights Front wheel independent suspension Fully automatic headlights GMC Connected Access Capable Heated door mirrors Heated Driver & Front Outboard Passenger Seating Heated front seats Heated steering wheel Heavy Duty Suspension Hitch Guidance wHitch View Illuminated entry In-Vehicle Trailering App Integrated Trailer Brake Contr