When I bought my 4Runner in 2005 I had the rotors turned due to steering wheel shimmy under braking. Now 7 years later the shimmy is back and I plan to get new rotors this time-around. I'm not sure I "need" the Tundra upgrade since my brakes feel strong but I do plan to start towing with this vehicle. So what are the pros and cons of the slotted rotors?