Yes I know all about the longevity and reliability of the Magnums. See my above post on that.
The only things I care about that it must be is long bed. Not looking for the more popular short bed show truck. Just simplicity when working on it, low-maintenance, and that it drives and hauls.
Preferences that are on the top of my list are rust-free (within reason, serious rust/rot I mean) a 318 motor and good price.
After that would be lower mileage, auto tranny (I hear ya on the OD it would be nice to be highway friendly), and working A/C.
Last would be heavy-duty towing ability (which may necessitate something more than a 318 but I don't really know). I don't plan on doing a lot of it, but there could be a need to take a car/trailer here and there in my future. Again that depends on the reality of that situation. If a major heavy-duty diesel truck is the way to go there, then I'll find an alternative for such rare occurences.
My dad had a '70 or '71 D100. Would be happy with one of those but my concern is age for a "daily driver", and the initial cost. I figure there's more demand for an early 70's vs 80's/early 90's.