Bennelson,
That is a good concept your sketch conveys. It would be easier to gain access to the bed of the pickup and just one person could lift the cap up. I have to agree with MetroMpg about the hinge point being the back top of the cab. The truck bed and cab are independent of each other (except for the Honda Ridgeline) and the two distinct body components flex to the frame independent of each other. This could be a problem.
If maybe you could hinge it at the forward top part of the cap frame itself, opposite the rear cab window, with that part staying in place while the sides and the top stay together and rotate upward about the hinge. A couple of hydralic struts in the right place would help lift it too.
That is the fun thing about design, it always begins with a concept.
Brett
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