The driver would be more conscientious about taking care of your car, like making sure your keys go in the right place where it is being towed, etc. if he gets a small tip.

Depending on how stranded you are, up to 20.00 for a tow is not unreasonable, five or more for regular things.

AAA drivers have territories, so chances are you may get the same driver and if you give him a tip, any tip, he will remember you the next time.