from passenger side rear wheel rattle

Kind of hard to identify a noise over the computer. If you only hear it on bumpy roads you might suspect a deteriorated bushing in a shock absorber, a broken anti-sway bar link, (if you have one on the rear), or a rusted or loose strap around the ends of the leaves on the leaf spring. If you hear it while driving slowly you're going to have to pull the brake drum off and look at the hardware to see if something broken and is rattling around inside it.