Bed covers. Cargo racks/roof racks
 

Does anybody have one of those Roof racks or Cargo racks on their truck. I am interested in putting one on my hard top Bed cover. I also want to make my bed cover open upward instead of from the rear. I want my bed cover to open straight up with some sort of hinges and shocks of some sort and want to have an idea about how heavy duty i need to make the hinges and or shocks. I also intend to eventually mount the spare tire on the cargo rack on top of the bed cover so any weight specs on the racks would be greatly appreciated.

here's an idea for the bed cover idea but i wanna make my own.
http://www.trucktrend.com/features/g.../photo_14.html

i intend on putting a tool box under it thats flush with the top of the bed that way its under the cover still. thanks for the imput if any