Catmando- I don't know about the others but the Dodges with diesels have the same goodies on the 2500 as the 3500- frame, brakes, axle & spring as well as tow ratings. Yes, I'm giving up two tires and the fenders that won't let you in the car wash or the drivethru at the bank- I can actually haul more trailer as the truck weighs less than the dually. It does seem to cook the back tires though, thats what happens when you warm the engine up a little and you can't hear them spinning over the clatter of the diesel. Just my .02- I think the Dodge 2500 Diesel is plenty of tow truck. Now if I was going to carry a 4k slide in camper around and tow my boat- that would be different.