You did post pics! Congrats nice looking setup. Can’t beat the deals on the 4th gens now. With the 3.55 or better Pentastar, ED, or Hemi, all 3 would tow that pretty well. Weird how many people want to pick a best motor when there is only “a best” for how a given truck is used.
1320 I dig the ole 12 valves but I think your 2nd post in this thread is as factually inaccurate as your first post. Perhaps it’s missing pertinent details. To speak to what I have experienced If those THs were 6,500 pounds or less and you kept to 65 mph or less my ED would use less fuel than the 5.9 not more. I say that as mine always uses less fuel than the 5.9s in our transport company. Been on many cross country deliveries running together. 575,000 miles used for commercial RV transport. If you were running slow enough to average 13.68 or under above scenario my ED following you would likely have gotten well into the 15s and not 9.6 mpg. Faster or heavier and yep the gap narrows quick but never have I used as much let alone more fuel than anything else where we have run together.
Is the 5.9 a better built longer lived workhorse absolutely.