I recently started to hear a metallic chirp/rattle coming from the rear of the vehicle when going over bumps of bumpy road. The sound is much like the sound of backpack metal zippers shaking rattling around on bumpy roads.
I can't seem seem to isolate the source even after removing everything from the rear and riding around in the back listening. Rear seat up or down makes no difference.

Thoughts or suggestions appreciated.

 

Now you've eliminated anything INSIDE the vehicle as the source, time to get it up on a lift and check the rear suspension. There's a lot of bushes where a failure could result in metal-to-metal contact over bumps.

Graham