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I have a 300 4x4, I've tracked down most of my rattling to be the plastic around the tailight area, where the rack mounts are. Just one of those things you have to ignore I guess.
I have a 500 auto, mostly get a "buzz" from the plastic just below the gas tank and only at a certain rpm while going slow. I've learned to ignore it or change rpms slightly.
On the 500, the cover over the radiator cap will vibrate and seem like the plastic over gas tank. Put a piece of foam under the cover and I think your vibration noise will go away.