Has anyone ever used a ballancing ring set up like the ones offered by Centramatic? ( http://www.centramatic.com/index.html ) Their 300-series ballancers are sized to fit various 15-17 rims and they offer sizes clear up to Big Rig size.... I found these doing a boredom search and thought they where interesting...never have to reballance after trail running or airing down and back up again. Not too bad priced either at 199.00 for a set of four. Any thoughts?