The pickup truck war is hotter than it’s ever been in the U.S. right now. While Ford has an all-aluminum F-150, GM just launched a brand-new GMC Sierra with an industry-first carbon-fiber bed. Ram is also going strong with a fresh 1500 model. Attracting more and more customers into dealerships is not an easy task, and this is where special models and limited editions come in handy sometimes. With a brand new Sierra 1500 on its way to dealerships, GMC just unveiled a new model. It’s called the Sierra AT4 and combines enhanced off-road ability with extra standard features and more premium appointments.