Had good service for years here until this year, a...

Had good service for years here until this year, although they tried very hard they were unable to achieve a routine mount and balance on two different cars. Lots of effort on their part to make it right, but after 6 tries balancing the wheel/tire combo, took each car to a different shop in town and on the first try both shops were able to properly balance them. Both shops informed me that all 4 on each car were out of balance. After this the highway speed vibration was remedied. Hope they figure out what was preventing them from being able to accomplish a routine balance.