Yukon XL is conservatively styled. GMC takes a more sophisticated, more understated approach to design than Chevrolet. Still, the Yukon XL shares the unmistakable profile of the 'Burb.

Denali trades the standard Yukon XL's black grille for a bright mask of fine-metal mesh, but then swaps the base model's chrome bumpers for body-color bumpers, keeping the overall flash level about equal. Round fog lights are neatly tunneled into the lower part of Denali's unique front bumper. Cladding adorns the lower body, running down the sides and incorporating the front and rear stone guards; the Denali's cladding is oddly shaped, but blends nicely into the color-keyed running boards.

Quadrasteer does not improve the appearance of the Yukon XL, as ungainly fender flares are added to the rear quarters to accommodate the significantly wider track (the distance between the rear wheels).

Yukon XL offers a choice of liftgate or split cargo doors for the rear. The liftgate comes standard and features a glass section that opens independently. Made of lightweight aluminum, the liftgate is convenient for quickly adding and removing cargo and offers better rearward visibility than the cargo doors, which block the view in the center where the doors meet. Cargo doors work better for work vehicles as they open wide and allow a closer working position to the vehicle's storage area. Cargo doors are also useful when pulling trailers because they will usually clear the trailer tongue jack. The hinges can be released, allowing the doors to open fully when loading large items. Most people find the liftgate preferable, however. Yukon XL Denali comes only with the lift-up hatch.