Glad to hear you are still liking it. Your comments and videos are a big reason I felt confident the 6.4 could do the job. Thank you for being one of the first.
I just rolled over 12,000 miles on mine yesterday pulling my 5vr back from our first trip out this year. No problems other than a nail in a tire and getting stuck in the mud once. Overall, I'm still happy with mine. I think the mpg (unloaded and loaded) could be a little better. I still only see 13-13.5 empty at freeway speeds.
The towing experience is better than my 03 standard output (250HP) Cummins 5 speed manual, but obviously not as good as it could have been with a new diesel. I am kicking around going back to diesel (likely won't happen since I just closed on our new house last week), but not at all because the Hemi 6.4 doesn't do the job. I miss the manual transmission some towing and that diesel low end grunt.