3200 is pretty high for an 89.....he should have every oil change documented for that price. I'd check it out, just make sure to get underneath it and look for rusted leaf spring shackles, rear brake/fuel lines, leaky gas tanks, etc. Mileage is nice and low, but see how much towing he has done with it, and look at that tranny fluid.
Good Luck and welcome to FTE!