I'm a little late coming in on this, wanted to ponder things before I said anything. I've only used Dynabeads a couple of times, both times were on lifted 4x4s with oversize off road tires, Super Swamper TSL Radials. I don't recall the exact sizes, but one set had been problematic in getting a good balnce on them. The customer, who also worked with me at the same shop, decided to give them a try. He said they did fine until he got to highway speeds, then the vibration came back. Not as severe, but still there. I don't recall any feedback on the other truck we did.
A thought did occur to me, though. I don't recall in our converations about you vibration problems if you tried this or not, Denny, but have you had the tires match mounted to the wheels? The road force balancers should have the capability of doing this, or at least the Hunter balancers do. Basically, the assembly is spun, valve stem location is marked on the tire. The assembly is then broke down, tire rotated 180 degrees, reseated and rechecked. The tire is then marked where indicated by the balancer. The tire is then broke down, and rotated to align that mark to the stem. That should put the tire so that the heavy part of the tire lines up with the light part of the wheel. I have done this procedure, and have managed to get stubborn tires to take under 1 oz. weight per side.
