GMC’s king-sized wagons are specialists at heavy hauling, towing and people transporting in all kinds of road conditions. Although both regular and longer XL configurations can hold up to nine people, the latter’s extra space is completely dedicated to cargo room. Both cabins include a fashionable dashboard and control panel complete with a five, or available eight-inch, color touch-screens that work the infotainment and communications systems. Like virtually all General Motors vehicles, Yukons come with Wi-Fi Internet connectivity for all aboard as part of a paid subscription through GM’s OnStar assist. Both regular and extended-length models come in SLE, mid-level SLT and Denali trim levels with a wide assortment of gear specific to each package. Among the Denali’s many touches are power fold-and-tumble third-row bench and second-row bucket seats, hands-free power liftgate, wireless phone charging and a Bose-brand 10-speaker surround-sound audio system. If the Denali had any more content, GM would have to paste a Cadillac Escalade crest on it.