also check for rust under the fender flares and under the plastic trim piece that goes along the rocker panel.
listen to the tranny and t-case for any whining and check for smooth upshifting between 1-2, 3-4, dont worry about down shift between 2-1, you have to be almost completely stopped before you can get it into first.
also listen for obvious whining from the rear end. pinion bearings, and seals should be spotless, if not you have problems!! rear axle bearings go out almost exactly at 100K miles give or take 10k so ask if they have been changed....when they go out, they go loud and hard!!
rust is your main issue, in utah, we use lots and lots of salt on the roads so zuks get hit hard. check everything for leaks.
