4WD? If Yes, have them change the Diff oil in the front and rear... if not just make sure all the major maintenance has been performed, like transmission flush etc, and then take a look at your rear differential and if the thing looks nasty you might want them to swap the diff cover for you with the newer one that has better heat dissipation. You could also check the air filter and some other things before you write your name, just check some of those things and have them fix them before you sign.
Besides the fix that should of happened to the brakes thats what I would do if I were buying a used one.
Besides the fix that should of happened to the brakes thats what I would do if I were buying a used one.