Knocking noise coming from rear wheel
So I recently had my tires rotated. To my dismay, the guy changing them jacked my car until the it looked like it was going to fall on it's side. About a week or two after the rotation, I noticed a knocking noise coming from the rear. I thought maybe it was something in my trunk. But recently, the noise is my pronounced and seems to be coming fromt he left rear wheel. The noise stops when breaking and sounds louder when driving slow.
Is it possible that this is due to the drum brakes? Need replacement? Loose cover?
What about the shocks/struts?
I'm gonna take off the tire this weekend and look around the area.
What should I look for?????