On the head of the bed they usually don't put support legs under the cross member, they just install screws, which makes the wood move under weight conditions. Just experiment with it till the sound is gone. Silicone helps also.
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2014 Ram 1500 CrewCab 4x4 5.7 Hemi 3.92 Rear and Air Lift 1000
2005 Jayco Jay Feather LGT - 29Y GVWR-7000 lbs.
Dexter Axle Lift 4-9/16" - installed with sub-frame.
Pro Series 1200 lbs. WDH with Double Sway Bar.
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