Hemi's are nice, until you hookup a 15K 5ver, even only one pull for a 500 mile trip, you will question your choice.
Gasssers equal high RPM, to the point they screaming trying to keep up the steep grades. Cummins equal quiet grunting at low RPM with more acceleration if needed to get up those same grades. I just drove 4000+ miles round trip, to get my pontoon out of storage, and climbing grades was breeze. But lets start with costs, Diesel is tons more expensive than the Hemi in initial costs and maintenance, but your savings are offset when you buy another truck after 150K miles to replace a worn out Hemi. But the Hemi allows you to keep up with the never ending upgrading in vehicle options, comfort and electronics. However the last three trucks I've bought, have been Cummins (04.5, 07 and a 2019) and I've traded them in with less than 80K miles, on the first two. Do I miss my gassers yes, until I use my truck as I intended its use for.