You're right about mechanics doing their own thing in GA.....But how much would you like to wager that NONE of them want to hear the word UNION ever again!
They dont need one, the situation is different , many (but fewer and fewer) suppliiers are dealing individually with more and more individual consumers.
In our industry you have a few consumers and several suppliers. These consumers have political clout and craft the laws to put the suppliers at a disadvantage, that plus the suppliers have failed to consolidate . Unions are supposed to act as a means to consolidate and equalize the leverage that collective capital has over labor. As the industry consolidated labor made no counter moves and therefore became weak.