I have a 2003 4runner and it has developed a squeak in the area of the rear passenger tire. The dealership has been unable to fix it or even determine what it is. At 20K I told them of the problem and they responded by tightening down my licenses plate. What a bunch of morons. The squeak is still there and it occurs even when I hit small bumps in the road that I can hardly feel. What is it? I’m taking it to my personal mechanic for the 25K service. Thanks for any help.