A test drive of Mack’s Command Steer active steering system evaluates how it can make truck driving easier and less tiring. Mack’s Command Steer active steering system is built to take the bumps and jolts out of even the nastiest terrain. Photo: Jim Park Testing the Mack Granite with Command Steer I first ran the course in a Granite not equipped with Command Steer Granite with the system. Testing the Mack Anthem with Command Steer Mack brought a couple of Mack Anthems to the quarry as well, with and without Command Steer. ROI on Command Steer Command Steer won’t reduce your fuel consumption or help keep air in your tires, but it will be a hit with drivers, especially those that work in challenging environments.