Theres definitely some potential for this.
What I do is so
I drape a towel over the side of the bed, over the wheel well, and a lay it out a little across the bed and I put the board on it's side resting up against the wheel well. I then drape the towel over the board and I generally put towels over the front and back of the board. I then keep a cleat in the track system near the back window of the truck and I have a long bungie cord that I pull back to the D ring in the corner of the bed. It holds the board in there extremely well. My friends made fun of me for "over" tying down my board but I like it that way.
I think it would be really cool to mount a rack on the bed rails. If it were mer, I'd get a wall mount rack and then attach some small steel plates to the track system by using bolts with large washers and then I would mount the rack to those plats.
Really though, I think it'd be over kill to have a rack system in your bed.. the towel and bungie method worked well for me. I hope to see where this goes!
Check the board in the background. My 7'6" has to lay over the tail gate as it does in the pic.