Personally I will never own a Ram, Chrysler of Dodge product.
The only way I would ever consider a dually is if it was dedicated as the camper hauler ad that was the extent of its purpose.
If I were to buy a new truck I would consider a Ford or a Chevy.
It it was the new Chevy it would have to have their new 6.6L and if it ended up being a Ford it would have to have the new 7.3L.
I wouldn't be afraid of either one being a first year engine.
The new 6.6 is an upgraded 6.2 and Ford's new 7.3 is old technology using today's technology.
I would never settle for 2nd best just because it was closer to me than number one.