Bed Vibration/Rattle

Over the last month my truck has developed a horrible rattle around the bed. I believe I have narrowed it down to dead center above the rear wheel behind the plastic. If I hit the wheel molding I can duplicate the sound. I have not taken the liners out yet to see what I am hearing till I know what is under there. I no longer work at Toyota and parts are at least 2 days out if I order them from my dealer.

Does anyone know what is above the plastics. I pulled the parts diagram and it showed nothing. I think is it a bed side brace but I don’t even know if we have them.

 

My truck has those little storage boxes.
You might pull one of those and reach back a feel around?

If you had cheap inspection camera you maybe take a bolt out of the bed side and look?