Many thanks, Phil, for replying again. You're the best.
I ended up taking a chance and bought the thing. $7500 plus $250 to deliver it 20 miles away. Tho I tried acting like I knew what I was doing in front of this guy, I was pretty much at his mercy regarding what serious problems it has.
The cab (including the floor) on this one is actually in pretty good shape. That's actually a bit surprising since a lot of glass around it is missing. Concerning the door, the left side latch does have some sort of issue which prevents it from locking shut. Haven't really had a chance to take a look to see what's up there yet.
The 4wd apparently has some kinda problem also. I asked the seller to spin the front wheels for me under power, but he said something wasn't connected (or maybe busted, I dunno) so he couldn't. With the motor off and the 2 front wheels off the ground, I spun the right wheel by hand and noticed the other turn in the opposite direction, so I'm guessing that means the front diff. is at least OK.
Wish me luck getting this tug going. I've got a a grand total of ZERO hours experience running one of these (took me 15mins just figure out how to get the engine to crank!). I'm at home working on cars and light duty trucks, but I feel like I'm a 5 years old kid when I sit in this thing and try to get it to go. Might be a good idea investing in an owner's (as well as a service) manual, I imagine.
On that topic, are the ones selling the .pdf manuals on ebay and whatnot legit? A $10 manual on CD vs. the usual hundreds of $ for the printed one seems too good to be true.