My 2013 Silverado 2500HD Crew Cab diesel has a tow rating of 13,000 lbs. with a ball and 15,800 lbs. with a 5th wheel hitch. The truck's curb weight is 7,294 lbs., the GVWR is 10,000 lbs. and the GCVWR is 25,800 lbs. I tow a 2014 Sunset Trail SF270BH that weighed 6,776 lbs. leaving the factory and about 8,000 lbs. on the road now. I have not found a hill in Virginia, Tennessee or Pennsylvania that the truck had to struggle to maintain speed while climbing with the trailer attached.
2013 Silverado 2500HD LTZ CC 6.6L Duramax Diesel
2014 Sunset Trail SF270BH
Holly & Buster, mini Dachshunds
2016: 1 trip, 3 nights in 1 state, 316 miles
2015: 5 trips, 18 nights in 3 states, 2707 miles
2014: 5 trips, 14 nights in 3 states, 2426 miles