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...
The problem with the Mega Cab is its ridiculously low payload capacity/gross vehicle weight rating (GVWR). If you're one who feels the need to stick within all of a truck's ratings - you're going to find that truck hard pressed to tow a lot of things. :(