Do you have the V6 or V8? I know the V8's require a timing belt/water pump replacement at around 90K. V6's have a timing chain that should basically last the life of your motor. Based on reading other folks' recommendations, I would check your brake calipers, suspension bushings, wheel bearings, CVs, and steering components as well. Also have them inspect your fluids (PS, brake, diffs/transfer case for 4WD, coolant, transmission, etc.). A coolant flush may be in order if it hasn't been done before. As long as maintenance has been kept up, your Runner should last for many years to come.