Do these mount at factory rocker points?

Yes. These are designed for factory mounting without drilling or modification. Use the existing attachment points on your frame.

Will the LED lighting work with my factory wiring?

LED wiring integration details aren't specified in the product listing. Have your installer verify compatibility with your Highlander's electrical system before final installation.

Does the black finish need prep or sealing after install?

The black powder coat is ready to install as-is. No sanding, priming, or additional finishing required.