I've been hauling my 3,000lb+ Wolf Creek and 16' trailer and SXS with my '12 GMC with a 6.0 all over Alaska's mountains without any issues. The newer (2011+) 6.0 trucks have a better/heavier transmission than previous models and a much heavy chassis and 36 gallon gas tank to extend your travel distance. I honestly have no need for a diesel, some folks do, it is a personal decision based on wants and needs.