Squeaky rear suspension

[FlaglerMegacab4x4]

Hey y'all got another question for you btw sorry if its in the wrong spot but I'm not sure what was the best spot. Anyway when I go over rough/dirt roads my bed sounds like a damn 10 year old farm truck that's hauled half the barn. It's super annoying I've tried shaking stuff around under there and of course I can't replicate it. I've sprayed everything rubber I can find down there including cab mounts, exhaust hangers, shock bushings, and even where the bed rests on the frame. So any input would be greatly appreciated, thanks guys.

 

[HolyRamBatman]

Gas tank heat shield loose?
Leaf spring bushings?

 

[FlaglerMegacab4x4]

It doesn't sound like a heat shield it sounds like a rubber on metal sound. Are the leaf spring bushings on the ends of the springs? If so then yea I sprayed those too

 

[jimdd810]

Body mount bushings sound like a culprit


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[FlaglerMegacab4x4]

I sprayed all the ones that are under the cab with WD is there any hiding under the bed that I'm missing?