Interesting stuff, 2014RR. I'm thinking maybe I'll take a shot at removing the running boards (could be a pain just doing that with the rusty bolts!), and take a wire brush wheel on the drill to the rust I see, then use the POR-15 to treat everything, and then perhaps top coat with Rustoleum black paint or bed liner as you said. My fear at this point in doing that is that I might uncover perforations that are unknown to me right now. But if it's there, it's there I guess. It's only going to get worse if I put it off. Thanks for all the input, guys. Mark