Start by getting under there and spraying all your suspension components with lubricant and then try it out. Weight distribution hitches have also been known to make noise, so try a quick tow without the bars hooked up.
Is it a factory brake controller or an add on?
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2013 F-150 EcoBoost MaxTow, Roush tuned (415hp 506tq), lifted on 33s, R.A.S.
2013 Jay Flight 28BHS Elite (Equalizer 10K hitch)
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