After a nearly 30-year hiatus, bed-mounted ?sport bars? are making a roaring comeback on America?s pickup trucks. The style, which resembles a roll bar fitted to a truck?s bed just aft of the cab, reached its zenith on Marty McFly?s all-black Toyota pickup in the 1985 movie Back to the Future, but more recently Chevrolet has added a sport bar to its Colorado ?Trail Boss? mid-size truck (even the diesel, no less!) and Toyota modeled a one-off, sport-bar-equipped ’16 Tacoma off of the BTTF movie truck. Now the sport bar lives at GMC, which added one to the full-size 2016 Sierra All Terrain. The creation is dubbed ?All Terrain X? and is an extra-off-road-styled version of the Sierra?s existing All Terrain model.

The X gear comes as a package on top of the All Terrain, which already brings four-wheel drive, skid plates, off-road Z71 suspension with Rancho shocks, a spray-in bedliner, rear park-assist sensors, and an “Inclinometer” to the regular Sierra 1500. The X package adds mud-terrain-rated Goodyear Wrangler off-road tires, black-finished 18-inch wheels, running-board steps, LED headlights, black trim and door mirrors, and body-color door handles. Oh, and let’s not forget that sweet sport bar, which comes with attachments for separately purchased accessory spotlights. GMC will offer the X in six colors, including black, white, red, blue, and two different grays. In any hue, that sport bar combined with the chunky tires gives the X plenty of atti...