mike I would agree with the other post , you will get a rim and tire heat from pulling , and the break tires are going to be a little warmer then the tag tire( no Brakes) I always check my bearing buddies to make sure there is a lot of grease in them the grease helps keep them cooler, and check by pulling on the top of the tires to see if you have a lot of play.if so the bearing a loose or a little worn .Rule of thumb for me is repack the bearings every two years if they need it or not. That way i can check them for rust and replace the seals. The few hours ever other year will safe you a ton in repairs.