Best older Dodge pickup for daily use?

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.
I guess you asked for opinions, so I gave mine. Not trying to talk you into anything. I will say, late 80's dodge trucks that are almost rust free are not as cheap as you hope. Maybe 2800 will get ya one. It seems like your using the process of elimination, so you have narrowed it down to what ya want. All that's left is to go find it.