This refers to the torsion bar noise. These bars run from the front wheel area, along side the vehicle on both sides and terminate about under the passenger doors. The bushings get worn and begin to knock when starting off or coming to a stop. I've found under carriage washes make it worse so I'd avoid those. As for the noise, a very good heavy duty silicone lubricant can be sprayed into the ends of each one, alleviating most, if not all noise. This is only a temporary fix so you will have to lubricate it about once a month. 

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