The major news from GMC’s unveiling of the new 2019 Sierra pickup truck included the announcement of a turbo-diesel 3.0-liter inline-six and a bed that incorporates carbon-fiber-reinforced plastic paneling. But the flashiest, coolest, and most fun part of the new Sierra is the MultiPro tailgate, which smartly incorporates various built-in hinges to help with ingress and egress, load stopping, second-tier loading, and access to the bed. Allow us to explain how it all works.
GMC touts the MultiPro’s six different functions, but that includes the normal up-and-down movement of the whole tailgate, so, um, okay. It’s damped for slow opening, which can be done by hand or by two clicks on the remote.

Within the full tailgate is a secondary cutout that extends to within a few inches of either side and stops at the space just below the large GMC logo. On the inside of this cutout is another flap that can hinge up and out toward the rear of the truck. With the tailgate folded down, that inside flap can be deployed in various ways, including as a stopper for an extended load.
Technically, there is no physical tailgate handle. The operations are controlled by two buttons that are stacked in between two camera lenses, where you would expect a conventional release. Press only the top button, and the main tailgate remains closed, while the small cutout (which GMC calls the inner gate) hinges down via two swing arms and stops parallel to the ground to make a table...