Think about this. In the diesel community, there are literally tens of thousands of Cummins swaps into other truck bodies. There are about a dozen swaps of a Ford engine into another truck body, and a few hundred Duramax swaps. Next time you go to a small hospital or radio station or police station go out back and see what kind of generator they have. It will have a big "c" on the side for Cummins, because it has to work. Every time. Even if Ford sold generators, no one would buy them.
Fast lane truck found the ram had the best mileage of the new three. They all are very comparable. If you don't work on the truck yourself, or if you don't keep them for more than 100k miles, then they will all treat you well. If you work on it yourself the Cummins is the smart choice. Parts are cheaper, much faster to install. Out of my last three Dodge/Rams I have nearly one million miles racked up with very few problems. Just my opinion.
