Are you supposed to tip the AAA driver?

I don’t need roadside help very often, but it is a godsend when I do, and I make sure every member of my family carries a AAA Plus card at all times.

This morning it saved me from being stranded with a dead battery. As the nice young man pulled away in his truck, I wondered all of a sudden if a tip was expected. I never thought of it before because it is a service I have paid for through my membership and I was in need of help; I thought of it more like calling a doctor than like going to a restaurant or having my hair done. But maybe it is customary?

You don’t tip your mechanic, do you??