As capable as they are handsome, the Yukon and the stretched Yukon XL are multitasking machines. They offer seating for up to eight, a maximum tow rating of 8100 pounds, and optional four-wheel drive. A 355-hp 5.3-liter V-8 and six-speed automatic powers SLE and SLT trims; the chrome-laden, leather-lined Denali offers near-Escalade levels of luxury and gets a 420-hp 6.2-liter V-8 and an eight-speed automatic. An 8.0-inch infotainment system, 4G LTE connectivity, and onboard Wi-Fi are standard.