What’s the best way to road-test GMC’s latest heavy-duty pickup? How about driving it through the Rocky Mountains towing a 11,500-pound RV? That’s exactly what the team at PickupTrucks.com did with the 2011 GMC Sierra Denali 3500 HD dually. Over the course of its almost-weeklong endeavor, the Denali trekked 1,200 miles, including climbing up the highest paved road in the U.S. Find out how the trip went at PickupTrucks.com. Also check out MotherProof.com’s review of the 2011 Toyota Camry Hybrid and the latest Q&A from Ask.cars.com.