JKenney, I have a '13 2500 Savanna 6.0L 6 speed. I pull a 8327SS. You will definitely know it is back there, but it will tow it comfortably. We took it through the Smokies last summer and it was adequate. I stayed in the right hand lane with the semi trucks on those long 6 - 7% uphill grades, RPM's up around 3000, 98 degrees out, and kept up with them. So, yes the 6.0 worked hard but did the job. Flat land towing it is a solid, drama free drivetrain that works VERY well. Hope this helps!
2013 GMC Savana 2500 FBI Edition
2015 Rockwood 8327SS stuffed with 5 kids!
Nights camped 2014: 48