Add the following to the previously mentioned issues... . Make sure the frame isn't broken where the steering sector bracket bolts to the frame, or the bracket that the sector bolts to isn't broken either. Also check the bracket that holds the front spring to the frame on the drivers side, they will break too. Check and make sure the inner door hinge brackets aren't tearing through the door skin. If the transmission is a getrag, it's a piece of crap, plan on replacing it. Note the latest issue of the TDR, it shows how to repair body cracks at the lower corners of the windshield, a common problem. Make sure the steering wheel is solid, if it isn't you'll be in for a fun repair. I will also note that the door handles like to rip off too, make sure they're solid. To be honest the whole 1st Gen platform is an ill conceived, poorly engineered, good looking pile of junk! And I wouldn't trade mine for anything! (almost anything).
For ten thousand frogskins that thing you're looking at better be CHERRY. Make note of the issues stated above, if they haven't reared their ugly head yet, they will and you will get to fix it.
Check that last statement. If the truck is used as a grocery getter it should have minimal issues.
I paid 6200 for mine with 270k on the clock last year. What sold me was the transmission upgrade, new injection pump and injectors, a good gooseneck hitch and a brand spanking new set of studded Toyo tires. I get SUPER good mileage with that old beater. It saved my bacon when fuel was $4. 70/gallon.
Luck in your negotiations,
Jon