The last set I had istalled, the guy dynamically balanced then on a special machine. After installing the rear, he was unhappy with the weight required, took the rear off, moved it 180 deg and rebalanced with less than 1/3 of the origional weight.
After watching that, I will try to get mine dynamically balanced from now on. I used to static balance new tire installs on a static machine, but I sure liked the dynamic balancer. No shop in Cranbrook has one however.