Assuming 1000 lbs additional weight, an additional 3HP will be required at 60 mph. Oh dear!
If you added height to rig, ea additional 3 sqft of frontal area is equal to HP of 1000 lbs, or 3HP. Add a foot, 1000 lbs, equal HP needs of 4000 lbs.
BUT!!!!!
If said trailer is more aerodynamic!, you may need less HP than you do now, and get better performance and mpg by .1!
Also remember, tow ratings are a performance/warranty rating. A 2011 is out of warranty. Performance wise, every one of us has different assets, so expectations are different.
Reality, assuming a 2500 series, no big, a 1500, might be a chassis retrain issue.
OPs call. I'd do it in a chebby heartbeat if an 8 lug truck!
Marty