Another fact about the centramatics - they are wonderful dust shields and heat sinks. The heat sink issue is not very obvious. Mainly because I don't over use my brakes and maintain proper speeds going downhill. The dust shield effect is very obvious. I have traveled with friends, starting with freshly washed coaches. At the end of the day looking at the brake dust difference between those without centramatics vs those with, it is a very big difference. I can easily wash my wheels at the end of the day just by foaming with soap, letting it soak, and pressure wash it away. Looks 90% good as new. Others without have tried the same thing, but are forced to use a rag to wipe them down.
For those that are picky like I am about keeping the coach clean, this will be the thing that you notice more frequently than any of the intended benefits. Tires are not going to stay any longer than 5 years on the front of my coach, and you can get 5 years with or without centramatics. Most people deal with the slight wobble or pull that the tires eventually get, and comfort drive does a lot to mask that effect. (at least I believe they do...not trying to start *THAT* debate).
I also placed the centramatics on all 3 axles. I plan on selling my coach in 5 years, so I will not know how long the rear tires will last. Same thing with my 2013 coach.