There is a noise that is driving me crazy. It occurs when the right rear hits any medium size bumps or potholes. It sounds like one of the interior panels is loose or the liftgate is loose. Initially it sounded like something was rattling around in the storage area under the floor of the cargo cover. I took everything out including the cargo cover. I checked the spare tire to see if it was loose ( it's not). I suppose it could be a noise from the suspension, but if I jump up and down on the back it isn't reproducible. Loose interior panel?, bad shock?, I don't have an idea of where to troubleshoot from here. Help...