I haven't found what I was looking for. I was thinking of a oval slotted rail inside the truck bed... they are often used as a toe rail on sailing yachts... But everthing I found was crazy money. Anybody have any experience with something like this? http://www.macscustomtiedowns.com/TrackSystemInstall

I don't know if thats the same one but my dad has them on his truck. They are reallly nice. A lot better than trying to get a tie down in that recessed hole in the bed (now covered by my tool box). The one he has is an aluminum rail maybe 11 gauge and it's really rigid.