2021 GMC Yukon First Drive Review by Larry Nutson +VIDEO See Also: Chicago Bureau The Auto Channel GMC’s full-size SUV, the Yukon, is extensively new for 2021. As part of the Yukon’s market roll-out the GMC team dropped a Yukon Denali at my doorstep for a 24-hour whirlwind evaluation. Actually, 24-hours is plenty of time to do my job, drive a bunch of miles in different road conditions and get done what needs to be done. The GMC-provided video product walkaround and overview as well as the audio guided tour filled in all the details. The Yukon is all about space and capability…lots of space for moving people and things, or for towing a trailer with something for work or play. The 2021 Yukon adds space with its nearly 5-inch-longer wheelbase and 6.1 inch increase in overall length over the 2020 model. Yukon now offers 41 percent more third-row legroom and 66 percent greater cargo volume behind the third row, now at 25.5cuft.