Welcome to the Dark Side (color of exhaust)! As the signature shows, we tow a Reflection 337RLS with a 2008 (Dodge) Ram 2500, dry weight of fifth wheel about 10,600 lbs. We are pretty much full-timing and have covered about 25 states, including all in the Rockies and many in the Appalachians. I believe you will be VERY happy with the power of the 6.7, and if you got an automatic transmission, very pleased with the engine brake. Our 4x4 rides pretty smoothly, and is quiet in the cab, so much so that unless the windows are open, you don't know it's a diesel. With your truck being 7 years newer, the refinements would probably make me drool! When/if we replace our 2008, it will be a new Ram 3500 dually with a 6.7, automatic, and towing package. Others have done well with Chev/GMC and Ford, but we are committed to Ram. Many happy travels and welcome!