The 2014 Silverado HD lineup is offered in WT, LT and LTZ models, in 2WD and 4WD -- including single- and dual-rear-wheel 3500HD models. All feature fully-boxed, high-strength-steel frames and offer an array of control features that make hauling and towing easier, including trailer sway control, integrated trailer brake control, hill start assist, automatic grade braking, intelligent brake assist and larger brakes.