The Hemi is a lot lighter than the Cummins and that weight savings in the engine goes straight to increased payload. So as long as your comfortable with the pulling power of the Hemi vs the Cummins, and it sounds like you are, then that increased payload will really help out with less squat.
We had a 2008 Ram 2500, CTD and pulled a 26' Cougar X-Lite and it pulled great but it did squat a bit. When I hit the scales I was over the GVWR for the truck by about 500#. I was fine with that but we decided to get a larger 5er, 2015 Mountaineer, and sold the Ram and got a 2011 F350. Pulls like a dream and no squat. Haven't hit the scales yet but I think I will be close but OK on GVWR
Bruce & Lori, both Retired, Charli (60 lb lap dog)
2011 F350, KR, 6.7L PSD, 6 1/2' box
2015 Mountaineer 331RLT