In case you wanted some off-road ruggedness with your 2015 GMC Sierra HD, the full-size heavy-duty truck is now available with the All Terrain package. Like its light-duty sibling with the same equipment, the Sierra All Terrain HD brings some unique styling cues and standard four-wheel drive. This new Sierra HD trim is available on both 2500 HD and 3500 HD double cab and crew cab SLE and SLT models. An electronically controlled transfer case is included as well as the Z71 off-road package which brings Rancho twin-tube shocks, hill descent control, and a skid plate. 

Other features like the CornerStep rear bumper, EZ lift and lower tailgate (which also locks), and upper tie-downs are also included on the off-road oriented Sierra All Terrain HD. StabiliTrak with trailer sway control is also standard. Inside, carbon fiber accents separate the Sierra All Terrain HD from the rest of the lineup and in case that's not enough, the "All Terrain" logo is emblazoned on the instrument cluster. For Sierra All Terrain HD owners with an iPhone running on iOS 6 or iOS 7, Siri Eyes Free can read incoming text messages. 

Turbodiesel an option

Under the hood, the General's 6.0-liter gas engine is standard but the 6.6-liter Duramax turbodiesel engine is also available. Other features like integrated cruise control, auto grade braking, and diesel exhaust braking help reduce brake wear on grades. The 2015 GMC Sierra All Terrain HD also utilizes enhanced airflow, which helps the engine to maintain power even while under duress and high temperatures. Standard safety features include forward collision alert, lane departure warning, and front and rear park assist. 

Like every GMC vehicle, the 2015 Sierra All Terrain HD comes with two years of scheduled maintenance, which includes diesel exhaust fluid refills, a three-year/36,000 mile bumper-to-bumper warranty and a five-year/100,000 mile powertrain warranty. Expect to see the 2015 Sierra All Terrain HD enter showrooms later this summer. 

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