Thanks for the responses. Even though I thought I had listed all my criteria in the initial post, I didn't. Let me answer a few questions.
Pre 85 qualifies as classics in TN. So a one time $25 tag fee and you are set. Yeah you can only drive it on the weekends, but that's what I plan on doing anyways. I like that idea, but I've seen trucks up to 94ish that fit my criteria so they aren't entirely ruled out.
I'd prefer manual locking hubs and an actual lever to shift into 4wd.
We have an Outback with the 3.0 in our current fleet, so it does everything the XJ does, and manages to get better gas mileage. I do agree with ReverendDexter, why would anyone want to put a load of stinky mulch in the interior of a vehicle? It's hard enough to get the smell of wet dog out of an interior...
So far, I'm looking at in no particular order F150's, Silverado/Sierras, and Jeep J10 and J20s.
I've seen 77-94ish F150's that all fit the criteria. This incorporates a broad spectrum, with everything from the 6cyl to the 351 motors available, manauls and autos, lots of features to stripped down trucks. I think after 91 though autolocking hubs became standard. Anyone know for sure? I like that the motors seem to be consistent throughout the range and parts are easily found and swappable. I see a lot of 351's near me, but I don't really know if I need the 351, and I hear they are pretty heavy.
I'm looking at 74-92ish Chevy/GMC variants. Most of the 88+ models seem to need some type of extensive work, but there are a few that fit my criteria. The Chevy/GMC's seem to be a little more expensive than the Ford's. Most of the Ford's seem to have power windows and in some cases A/C which the Chevy/GMC's don't have. I like the same thing about the Chevy/GMC except that I believe the 305 and 350 were used in just about every car for years so I'll be able to find parts anywhere.
Lastly, Jeep J10 and J20s. I've always been a Jeep guy and these are very interesting to me. However, most of what I see for sale need a lot of rust repair. I think if I could do rust work I'd be all over these, but no such luck for me. It seems they came with 2 motors, the 6cyl and the 460 with no in between. I'm not sure how the 6cyl would go down the interstate, nor do I know anything about parts supplies. They appear to be smaller than the Ford and Chevys, and look to have smaller beds, but man they look good.
I'm sure there is more I am forgetting but that gives you guys more of an idea of my very random thought process.