I have a 2500 06 Dodge Mega Cab with the Cummins in it. Dodge says it can tow 13k but on the cummins forum people say this is a joke and it can tow a lot more. A few people have said they tow 30k on a...
IMO, the tire and axle ratings are more important than what Dodge rate the truck for. I would be very comfortable towing what you are considering with your truck.