I tow with a 2014 3500 15 passenger with the 6.0L. I pull a Jayco 32ITSB. I went to Utah from Central Illinois with wife and 6 kids. Van with kids and their van supplies was 8200# and trailer weighed in at 8600# when we left. It pulled wonderfully. Plenty of power, never once thought I wasn't going to make it up any hill. Averaged 8.5mpg while towing.
Pull the trigger, your shouldn't be disapointed.