CHEVROLET'S 2003 CHEYENNE CONCEPT: THE TRADITION CONTINUES DETROIT - Chevrolet has been at the leading edge of the pickup truck's evolution, at times signaling the changes to come. The 2003 Chevy Cheyenne is the latest example of this tradition of innovation. Inspired by a rich heritage of breaking new ground in function and style, the thunderstone metallic Cheyenne is a statement of what a new generation of full-size trucks can be. Cheyenne…