If you've got toys to tow, the 2017 GMC Sierra HD should be on your short list of heavy duty trucks.

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Although it's available with a gas-powered 6.0-liter V8 engine, we tested the new 6.6-liter Duramax turbo diesel, pumping out 445 horsepower and a staggering 910 pound-feet of torque.

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The Sierra 3500 HD can tow 22,900 pounds with a fifth wheel or 20,000 with a ball hitch.

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The 4x4 system has an electronic locker that will engage automatically if it detects wheel slippage.

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Max payload in the Sierra 3500 is nearly 4,000 pounds.

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The front fascia is dominated by a massive grill. Big enough to swallow small woodland creatures whole, I bet.

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The Sierra 2500 is also available as an All Terrain X special edition for off-road fun.

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It's mostly an appearance package, but it does include meaty tires, skid plates and off-road suspension.

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Whether you choose the Sierra 2500 or 3500 HD, the interior is very well-appointed with leather seats and the excellent Intellilink infotainment system.

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Click through to see more photos of the 2017 GMC Sierra HD.

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