The 2015 GMC Sierra HD All Terrain adds more off-road goodies to the package
GMC introduced a new version of its redesigned 2015 Sierra HD called the All Terrain variant, which obviously by virtue through its name, is an off-road biased version of GMC’s big and tough Sierra full-size HD beast. Because the All Terrain package is specifically available with the Sierra HD, that means the brand’s potent gasoline […]
