You're a brave man. Everything is suspect unless you got a stack of receipts with that truck. I couldn't buy it, don't need the suspense.
Pretty big leap from a new mid-size to something even 1/2 that old and mileage.
At this point I’d drive my CTD across country. I trust it enough now. You DO need to scrutinize the seller carefully, and expect to spend some bucks. For example, I did all new front brake lines (hard lines). OP had replaced the AT and tires were pretty new.
You’ve got to search and learn about what you’re searching for...
But the main thing is the definition of puttering around. To me, it means a vehicle that won’t go far or be all that “mission critical”, just going here and there occasionally. If op has another vehicle, why sink huge money in a truck that will be used for puttering around now and then? That’s kind of the point.
If my CTD failed tomorrow, I’d be no worse for wear. Because it’s my puttering around truck... at least now that I’ve done most of my major hauling...
Of course now I’m tempted to take it to 500k...
So my point to OP is if it’s not all that critical, not the daily, look for something interesting and different and older. Find a big block work truck or something. If it’s not going to get big mikes, the bills aren’t going to be huge.