Thanks for the feedback!
FYI- I used SEM - Rust Mort, rinse with water, dry, acetone, etching primer, and Hammerrite Direct to Rust (DTR) rattle can on my cage and front bumper eight years ago, and much to my surprise rust is showing up now!
I am prepping a new front bumper with very light rust, and based on this feedback I am thinking: media blasting, Ospho, rinse, Rustoleum Rust Converting Primer, then apply Rustoleum Rust Converting Paint.