Nissan Titan pickup concept Nissan North America, Inc. (NNA) today unveiled the Titan Onyx, a concept version of Nissan’s popular full-size Titan pickup.  Designed to add a new level of visual appeal for customers who seek higher levels of customization, the Titan Onyx is highlighted by 20-inch chrome wheels, chrome running boards and a unique grille and deep front valance. Inside, the Titan Onyx features black interior trim, “satin”…