I had a 1987 model years ago. Loved it. It was an ex-South Carolina State Police vehicle with only 30,000 miles or so, rubber floor covering, and all the heavy duty extras when I bought it. Sold it with 160,000 miles a few years ago. Abused it, rode it hard and put it up wet (muddy) and never had any problems with it to speak of. Was a great tow vehicle for me as well. My son used to call it "the beast". Now it doesn't seem like it was a good idea to sell it after all. The guy that bought it from me was as excited as a kid on Christmas morning when he came to pick it up.
I had a 4" suspension lift (if memory serves correct) with 33x12.5 mud tires. The rear driveshaft is fairly short, thus, even with lowering the transfer case, lengthening the driveshaft and using angled shims to rotate the rear diff up, there was always a slight vibration in the driveline.
As others have said, these are simple vehicles with enough room to crawl in under the hood and sit on the inner fender. The top over the back seat and cargo area is removable, but difficult to keep from leaking once removed a time or two. They sell a soft top for these that will replace the hard top and is easily removable.
There is enough sheet metal on these things to re-skin an aircraft carrier. So regardless of the extent of rust, don't worry, you will have plenty left.
You will wax it by hand only once.
I still miss all the exposed sheet metal on the dash and interior. You don't see that anymore.