You can take this with a grain of salt....
I had some really irritating noises coming from the back, and after doing some insulating of the floor and other parts, it became even more irritating.
After looking at things for a while, I did a couple of "maintenance type" things and have heard no more since. (Though I do have to repeat the maintenance now and then!)
The latches (strikers) for the doors, and the rubber "anti-chucking" bumpers got a nice thin lubrication coat, as did the rubber boots in the rear doorjambs for wiring to pass into the doors. I would NEVER have believed that could be what I was hearing. I kept thinking that a door was slightly loose or something.
REC
Happily Transiting