My '98 windstar has a rattle from the rear that sounds like maybe the hatch is loose, except when you have someone else drive and go back there it is definitely coming from the driver's side rear tire area. I replaced the shocks and shook the suspension parts to look for something that is loose. I can't make the noise by bouncing the bumper while stopped. Do you think it might be a bad bearing or a loose brake shoe? Its not proportional to the speed really or grinding sound like you think of with a bad bearing. Rear wheel has no shimmy. Happens more on rough pavement.