Lol, you guys are tough!! I like the sounds of the 6.4, and I do love my 6.0 GMC at the same time. Definite going to keep my 6.0 for my one employee to run around in. My biggest concern is when I am towing 10-12k with my 6.0, there is times I wonder if its going to make it up some of the local steep hills. A good running start generally does the trick, but idk if its just because its old with 121k miles, or would the little bit of a boost between a newer truck and a slightly bigger motor, would that give me the little boost I am looking for without going into a diesel? Are guys out there pulling 12k with the 6.4 Dodges without issue? Thanks for all the responses so far!!!