I use
one like this to fill dual tires. stems should be 180* from each other. I would also use
These beads for balancing. Remove all external weights and add the proper amount of beeds and forget it.
I bought one of
THESE to measure and put These
from WalMart into bags for my tire Guy to install with my new set of tires. They balance great and I feel no vibration. Even if the tread picks up small rocks the beads will compensate for them.
I don't have a clue as to how long the plastic ones will last but I wanted to try them. For a Dually I would go with the more expensive DYNA-BEADS.