We drove all versions of the all-new 2008 Ford Super Duty, including 2WD and 4WD models and 2008 Ford F-250, 2008 Ford F-350, and 2008 Ford F-450 models both with unladen and fully-loaded beds. Our one-day test drive began in the congested environs of Las Vegas, Nevada, motoring along busy city streets, to the ring freeways that lead to the more isolated highways near the high-desert location of Laughlin, Nevada. Here, Ford and other truck manufacturers conduct their extreme hot weather, trailering and towing tests. During the test, we were able to tow up to 18,000 lbs. on steep grades of five, six and seven percent. We also tested this vehicle in the hill country of Texas, under icy conditions.