Mil-Spec's uprated Hummer H1's are built to tackle the most challenging terrain you can throw at them, but a host of new upgrades make their latest edition about to take you farther afield too. The heart of the new overlander is a 6.6-liter LBZ Duramax diesel making 500 horsepower and 1,000 lb-ft of torque, backed by a six-speed Allison automatic transmission. A redesigned drivetrain features new driveshafts with Wilwood six-piston calipers providing ample stopping power. For the first time in a Mil-Spec build, a long-range 30-gallon aluminum fuel cell with integrated steel skid plate extends your time outdoors, while the four-door hardtop and pickup bed make stowing the necessary gear a breeze. The Executive Interior Package adds a softer contrast to the brute exterior, with quilted Nappa leather seating surfaces and a Kevlar-reinforced liner on the floorboards.