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I have 2019 tradesman 6.7 3500 also had rattle sounded like it was by passenger rear seat. I put in baby car seat and tighten to the rear latch hooks on passenger side and noise went away.
Also had the clunk going over rough road sounded like passenger rear seatbelt. I put a car seat there it hooks to the latch hooks. After strapping it down . No more noise. So it could of been rear seat??