I have owned 2003 GMC Duramax, 2006 Chevy Duramax, 2012 GMC Duramax. All no problems at all whether towing travel trailer or hauling truck camper. I now own a 2016 DRW Ram Diesel. The reason I went with Ram this time was GVWR as mentioned and showed in the previous posts. Ram was more. I have hauled my 4500 lb camper on the new truck from Salt Lake to Yosemite across the middle of Nevada and up Tioga pass in the eastern Sierras. Performance is the same in all my trucks, then again I dont push any of my trucks to there limit or add tuners, they all were as they left the factory. Regular maintenance done. As you can tell I am not partial to any of the big three. All are very capable of doing the job. However GVWR was important in my decision.