New tow vehicle...6.4 hemi or Diesel?

2012 is a 6.7 2008 on, are 6.7's
very true, I began towing with A 2500 with a 5.9 Cummins since 1996 thru 2002, and the 5.9 3500 from 2003 thru 2006, then the 6.7 from 2007 to the present 2012, and I still own that one. The 96 I had ran a Jacobs brake Installed by the Cummins Dealer in Phoenix, and it was a Godsend on that truck if you were heading in any Direction out of Phoenix.

In my opinion the diesel upcharge is worth every penny, even if you have to buy Diff.
on top of the performance and the beefier frame, suspension,etc the diesel money comes back in the end, and resale on a Cummins is outstanding. The 100,000 mile engine warranty helps too.