Unfortunately I noticed a hole just like this on mine. Never noticed it before and this thread made me want to go out and take a look. Sure enough there is a nice size hole underneath my passenger rear door in the rocker. Everywhere else looks ok.
Because my truck is a 2012 and the rust has perforated through the metal I should be able to get this fixed under warranty? I will post pics
This sucks, not much I can do at this point to prevent it since it has already penetrated, especially going into winter. I've been working on rust proofing everything underneath on the frame to prevent this very thing from happening, but didnt notice the hole on the rocker. I can flush out the rockers and put new tape over the holes that was mentioned earlier in this thread, but I'm past the prevention stage at this point. Not sure if I should cover the rust hole with gorilla tape to prevent salt from touching it or leave it be?