The 2019 GMC Yukon XL SLT is a gasoline-powered SUV with four-wheel drive, a backup camera, and safety features like lane departure prevention. The SLT trim level stands for "Special Luxury Trim". Engine: 355 horsepower at 5600 rpm. Safety features: lane departure prevention, brake assist system, backup camera, and heated driver and passenger side door mirrors. Standard features: 12V power outlet Bluetooth streaming audio Bluetooth wireless technology CD player Climate control air conditioning Cruise control DVD entertainment system Interior: spacious interior and sunroof availability. Other features: four-wheel drive and heated driver and passenger side door mirrors. The SLT trim level is available on a variety of GMC vehicles, including SUVs, pickup trucks, and crossovers.