The Chevrolet Blazer has remained a mainstay of the midsize SUV market by providing durability, utility and, especially last year with the newly introduced Trailblazer, a touch of luxury appointments. Its traditional contours are overdue for reshaping. Indeed, a Blazer new from the ground up is not far away, but the Blazer's classic rectilinear shape appeals to those who like a truck that's shaped like a truck and not something squeezed out of a toothpaste tube.