As mentioned above, KBB it to see, or at least include your zip so we know location. Being that it's 4WD, location is important. You can also use NADA and Edmunds to get an idea on market value. Because the timing belt is not done, the only service records I would be concerned with are fluid changes (oil, coolant, transmission). Rear axle seals commonly go out on 3rd gens with similar mileage so look for oil on the rear wheels and ends of the rear axle.