I bought my own used tire machine and I’ve been using internal balancing media. So far I‘ve liked the stuff from Innovative Balancing, ceramic bead media. I tried a glass media in the green Ranger, but either I didn’t use enough, or it’s a bad product. The ceramic beads from Innovative work great, the ones in the tires of my F-150 are in their third set of tires and are fixing to end up in a 4th set. I’ve had the speedometer pegged and it was smooth sailing. I run the “off-road” beads in the 31’s on the F-150. Also have it in the 35’s on the Choptop, the 33’s that used to be on it have those beads too. Mom’s Explorer has them. Everyone is happy so far. I have a set for dad’s Ranger too. My buddy got some glass beads that look like they could work just as good. We shall see. Since it balances as you drive, it constantly re-balances as your tires wear. Physics at work…