The all new GMC Sierra 3500HD is one tough truck. Just ask PickupTrucks.com.

Available for test drives at Battison Auto Group in Duncan, Oklahoma, the Sierra with diesel and dual-rear wheel power beat other rigs in this macho competition. PickupTrucks.com sent each vehicle up 2,200 miles of high-grade inclines, descents and through oppressive heat while towing 19,400 lbs.

With 6.6-liter Duramax diesel V8 standard, Sierra 3500HD produces 397 horsepower and 765 pound-feet of torque. It includes revised rear springs, spring shackles, cargo box mounts and cargo boxes. This allowed Sierra to tow 23,000 pounds with a fifth-wheel trailer - up from 21,700 pounds from previous model.

"When GMC says their trucks are 'Professional Grade' they absolutely mean it," Ted Nichols, general manager of a New Hampshire GMC dealership noted.¹

"Every GMC truck is designed and built with the professional in mind. GMC owners are people who use their trucks to make a living, whether hauling livestock, construction equipment or anything else. They can't afford down time, so they chose the truck that will be there day-in and day-out."²

Source: ^1,2http://readme.readmedia.com/Diesel-Powered-GMC-Sierra-Wins-2-200-Mile-Towing-Challenge/2960925