What I don't like is that it looks buckled outward and extends down to the wheel arch. I just don't know if you would be able to get it back straight enough.
I straightened this little bang out and it took me a long time and was a *****.
It didn't look that bad at first, until I put a straight edge on it.
This was a near perfect rust free AZ bed and i was going to save it. So I ended up cutting it apart. Pulling the large dent out, making sure it matched the other side, and welded it back up.
Dent gone: