I know I wouldn't be trusting my bikes to a $100 home brew solution. I would be installing Yakima/Thule or Rock Mount 58" cross bars with a T rail adapter on the towers, then how ever many bike trays as needed. I would get parts if possible on Craigslist (except the T rail kit), and install the bikes as far towards the center of the bed as possible to allow side access into the bed. This system would only be maybe 4" above the truck side rails so easy to lift bikes into the trays.