Hemi 6.4 or Cummins

I traded our 2014 6.4 Hemi for a 2015 CTD after just one tow. Our TT is right at 8000 lbs. While the 6.4 was a nice truck, I did not enjoy it as a tow vehicle, esp. on hills or with any kind of wind. Hemi returned 7.5 towing, averaged 13 unloaded and would get up to 18 striclty highway. The CTD is averaging 12 towing the same trailer, 18 mpg unloaded and 20.5 on the highway. I am MUCH happier with the CTD, the torque this engine puts out, loaded or unloaded is always pleasure to drive. Cost to operate is about the same overall when you take resale value and the better mpg of the diesel, esp. towing. Take a look at TFL trying to tow a load up the IKE Gauntlet with a 6.4 it has an issue with first gear lock in (which I experienced) and also a tendency to shift driectly from 4th to 2nd on even mild grades. IMO if you MUST have a 6.4 at least get the 4:10 gears (mine had the 3:73s).