The GMC Yukon comes in four basic configurations: Yukon, Yukon XL, Yukon Denali and Yukon Denali XL. XL versions of the Yukon come with a longer wheelbase and more interior room, while Denali versions are packed full of luxury. Two engines power the Yukon: A 5.3L V8 with 355 horsepower supplies power to Yukon and Yukon XL models, while a 6.2L V8 with 420 horsepower provides thrust for Denali and Denali XL versions. GMC claims that the engines should provide best-in-class fuel economy. Within the Yukon and Yukon XL models are two trims -- SLE and SLT. SLE versions are more basic but still include plenty of amenities. Highlights on the SLE include a rear vision camera, hands-free liftgate, front and rear park assist, an IntelliLink infotainment system with Apple Car Play and 8-inch color touchscreen, rain-sensing wipers, a Bose premium sound system, remote vehicle start, keyless entry and a navigation system. SLT versions include leather seating surfaces, heated and cooled front seats, heated second-row seats, power-folding third row seats, a heated leather steering wheel, power adjustments to the steering column and pedals, and a blind-spot warning system. At the top of the lineup, the Denali comes with all the luxury features from the SLT trim, but with an upgraded sound system and magnetic ride control shock absorbers. The Denali also gets unique styling both inside and out. The Yukon option list is extensive. It includes a variety of 22- and 20-inch wheels, a rear-seat entertainment system with a Blu-ray player, adaptive cruise control, a heads-up display and a panoramic sunroof. Safety systems on the 2019 Yukon are state of the art. Electronic aids such as anti-lock brakes, traction control and stability all come standard. Optional blind-spot warning and lane-keeping assist also aid road safety. All Yukons also come with a 6-month subscription to GM's OnStar service.