MagicMtnDan
FRF Addict
Maybe something like this?
http://www.cargogear.com/Straps_and_Tiedowns/Anchor_Points.htm
Nissan had something similar offered from the factory (Utili-Track) mounted in the bottom of the bed (was stouter looking than what is shown above)
I've seen that (thanks for posting it).
I think that's a viable solution up high along the rails but I want something that's much lower in the bed. I'm not sure it could be mounted mid-way up the walls from the bed floor (or lower). There's probably a system out there that would work but I'll probably MacGyver something.