FWIW: Bad bearings don't always produce excessive heat. I check tires, wheels, drums and hubs for abnormal heat at most stops. I had bearings repacked by a reputable dealer less than one year and 8,000 miles ago. All bearings were good at that time, and I found no abnormal temps since then. When I recently removed the 16" wheels to install 17.5" wheels, I found bad bearings on the front axle. They were very noisy just rotating the drums. New bearing sets for both axles are on order.