If your rocker panels are rusting out, there's a good chance that your floors are close behind.  The underside of the floors in your vehicle take a beating from the elements, and the topside of the panels can too, especially if the weatherstripping around your vehicle's doors or windshield are letting water through.  That water will pool up under the carpet or vinyl flooring, causing rust to form.  If you have old floor mats, or no floor mats, moisture from water or mud on your shoes will seep into the flooring which will also cause rust to form.  Floors are one of the few body panels that take such abuse from both sides, allowing rust to destroy them faster than most other panels.  If your floors are feeling soft, it's time to repair them with quality steel repair panels from Raybuck.