Discovered today a very real potentional rust cause for the bottom edge of tailgates. At the lowest point in the inside corners, there is two plastic caps / bungs. When I removed mine with a paint scraper, the inside was chocker full of crap, that with moisture, would never dry out, and slowly rust away the lower section of the panel. The holes are drain holes for any water inside the rear panel, that could access through the lower vents, or through the top wiring access points with old cracked bungs no longer sealing those holes. Simple preventative solution, is to remove the bungs, remove the inside door card, and hose out the inside of the tailgate. The amount of muck that flowed out the holes until the water ran clear, was quite alarming! Something I intend to do again every couple of years, from now on....... Bungs look like this: And inside was like this!