Before buying a used 15 sierra HD diesel I was pulling 9k plus with a 2014 1500 Silverado 5.3l and all I can say is it wanted more from my foot. It pulled like a champ. Yes I felt it behind me but w8th the trailer brake I felt safe. 100k plus before the trade.
I bought the 2014 when I traded another 2011 and pulled the trailer w new one right out of dealer lot.
Don't be afraid to use the truck as it should.