Tool Box

I just bought a 2012 F250 6.7 4x4. It's a SWB. Anyway, i'm gonna be pulling my 5th wheel RV with it but, I want a tool box. There's not alot of room left after installing the 5th wheel. So, it looks like I might only have one option. An in bed tool box or possibly one of those slim line type tool boxes.



I was just wondering what everyone else uses.