Mich. truck plants on edge.

WAYNE -- Building behemoth SUVs and pickup trucks in the heart of Ford country once guaranteed a secure job. Ford Motor Co.'s Michigan Truck Plant in Wayne was the most profitable auto plant in the world in the late 1990s. And the Dearborn Truck Plant at Ford's famed Rouge complex was touted as a showpiece of the automaker's rich history and groundbreaking innovation when it launched F-150 pickup production three years ago.