What is the loud rattle in the back seat behind driver side?

What is your question?

It is a loud knocking noise in the back seat on the driver side when hitting bumps on a road. I thought maybe it was the door rattling. There is also some squeaking in the back seat as well.

What makes this problem better or worse?

Uneven terrain or bumpy roads

How long has your 2015 Ford F-250 Super Duty had this problem?

Year