To add to this, this corner area is also damaged by the base model type running boards mine came with. The rear end cap is shaped so that it funnels crap up to blast this area from below. When my running boards came off, there was severe paint damage (like sandblasting) in this area. I think some of the rocker damage is also due to running boards wearing paint in spots. It's worth pulling them to check.
Yup. Honestly , better of removing them completely.