One thing about those J hooks is that you can get then in a longer length then what I got (I only needed 3 inch ones) for less then a buck a pop. So you can still bed rail mount them like I did without removing the bed rail caps themselves, or drilling into them.
If you want some better pictures of say, the interior of the box, I can get some. I mounted it the same way in my Dodge too, and it's awesome. And a lot cheaper then the ones from Lowe's.