There will be individuals stating they have great experiences with the newer motors, no problems, etc. and that could be very well true. But with anything mass produced, especially newer, it can be hit or miss. No problem if you are in a school of fish and a few others are always getting picked off....but if you drew the wrong number in it, then, well, not. Could be very costly to you in many different ways.
Remember, there's a reason why that horse is in the "sale barn" as I was once told. Older trucks, very low mileage, great shape....low price? All combined means "do your research first."
Going off your post, you aren't rich and/or don't want to finance a depreciating item 7 years, so considering cost too.
You're a flatlander, nice area though. So I'll keep it to gassers as that's what you alluded to.
So on that note:
I did an autotrader search in your area, me being me, looking at older vehicles. Then researched some of what I found. Great deal in OK on a dodge 'hemi' (lol).
the 'new and improved hemi...:
"I have a 2016 2500 6.4 hemi with 42000 miles on it at the dealership with what they are saying major problems . They are telling me it has to be torn down or engine swapped , there is a high misfire count in cylinders 2 and 6 most likely caused by piston slap ."
My 2014 6.4L HEMI had piston slap from almost the day I bought it. I took it in to the dealer for diagnosis and they performed a series of tests as recommended from RAM.
"There was a TSB for a narrow range of engine serial numbers (2014 production) that had been assembled with undersized wrist pins hence the piston slap issues.
My engine was replaced at around 1800 miles."
Great deal in OK on a 3/4 gmc, vortec. But is it?
Again, do your research and don't rely on a few people stating their personal experience:
You've invested in a Chevy with the legendary 6.0 Vortec engine. It's a workhorse that's supposed to last for years, but lately, something doesn't feel right. That ticking noise or mysterious oil spot has you
cartipsdaily.com
Here's one I would look at. It's a small block, though don't know if that would be an issue with you. I have a SB in my trucks and it works for me as I no longer haul loads in the mountains nor drive 100-200 miles a day.
2010 Ford F250 XLT AWD/4WD, 65K miles, $16K.
Want big boy capacity, there's a 2002 f350 v10 in wahoo, DRW, 2wd 74k miles for 17k. Multiple owners. Don't know if you need that capacity though, that's your call. This motor is early enough to avoid the latter govt restrictions on what us serfs can own, so it'll be better. And there's more metal there to get that performance out of, vs smaller motors being pushed to the extreme.
Good luck and do your research.