Do these plug into my factory wiring harness or do I need custom wiring?

They're hard-wired and mount at factory points, but run the wiring to verify the connection type before final installation. Your truck's electrical system may require an adapter harness depending on your year and model.

Can I change the RGB color while driving or does it stay one color?

RGB capability means the rings are color-changeable, but the control method—whether it's a dash-mounted controller, phone app, or automatic color selection—isn't detailed here. Verify with support what control options ship with your unit.

Will these headlights fit if I still have the factory beam assembly housing?

These mount at factory headlight points, so yes—they're designed as a direct swap. Remove your stock headlights and bolt these in place. No modification to the factory housing is needed.