This is fact take it for what it's worth. The Cummins Engine and Aisin transmission are both true Medium Duty components of the RAM truck that is independently rated to tow about 28.5K (3500 crew dually 4x4) by SAE J2807 standards. Meaning they back up their claims not just add numbers.
I tow 29K combined with my 11 RAM Dually and i can tell you it's rock solid in all weather and lane change conditions. Test drive all three. There is a reason RAM is taking market share every month in the HD pickup market. Look at the "independent" guys using their trucks to haul RV's and cars. Most are RAM's and GM's very few Fords anymore.