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Mine does it but it's something in the door. I fixed the same problem on another of the same truck by putting RTV on all of the stretched out rivets holding things together inside the doorl.
it could also be break pads, if your anti-rattle springs are worn out. Try riding the brakes a touch when you go over any bumps. if the noise stops then you know what it is.
Could also be the lower bolt that goes through the shock is worn down leaving space and the shock is banging against it. Pull the bolt and see, not a big job. If it's a little worn, wrap some electrical tape a few times around the center and replace it, then look for a new bolt, in the mean time it will quiet down.
Radius arm bushings are a big pain! so lets hope its not that. Does it do it when you steer or really only on bumps. hard braking? changing direction from reverse to forward?