Mike 415 has the key points. High miles or low? Towing every day or sometimes? How heavy is the tow?
I am low miles, carrying a camper, pulling a boat. Truck weight is about 12600 lbs, max for the truck. But the total weight is around 15000 lbs, which is not an overall large load. Not an easy decision.
DR



'06 F350 DRW V10