What do you think about the price?
With the wheels off the ground, lift the wheel or axle flange by hand to feel for any up and down play. If you feel any, it will need new bearings and seals, and maybe axle shafts if the bearing of that model run directly on the axle shaft.
Rotate a wheel back and forth to feel for excess backlash in the ring and pinion. There should be some play, but not a huge amount.
If you detect problems, you need to cut his price in half to cover repairs.
