The 2011 Ford F-550 Super Duty, part of Ford's third-generation super trucks, is a rugged and versatile workhorse powered by a 6.7L Power Stroke V8 diesel that generates 300 hp or a 6.8L V10 gas engine outputting 362 hp, both tied to a 6-speed automatic transmission. The truck is available in XL, XLT, and Lariat trims with choices of a 4x2 or 4x4 drivetrain. Its impressive towing capacity and payload speak for its workhorse identity. Inside, it's no penalty box, with available SiriusXM radio, SYNC voice-activated communications, and navigation system. Safety features include driver and passenger airbags, traction control, and available reverse vehicle-aid sensor.