Did major patch work on my 07 last March. Both rear quarters in front of rear wheel. Cut outer skin 5 X 5 area and pulled out as much foam as possible. Sand blasted inner metal, sealed and then weld new patches to outer skin. Take a look at your rear doors. Remove plastic strip on bottom of door and check the seam for rust. Mine was just starting on both rear doors. Cleaned them also and repainted. My dad and Father in-law are both retired body shop owners. Once we started looking there was more to do than originally thought. All good now.