[Richard and Rhonda]

Did you look at the bushings on each end of the suspension arms. Look at the ends of the two parallel arms. Big bushings at each end. Constant movement at those bushings with any coach movement.

I am trying my best not to suggest you check the scales, but the devil got the best of me.

Seriously I would squirt the bushings with penetrating oil, silicone doesn't wick well into tight crevices.