I've been thinking about a side-latched or front-latched hinge, maybe with optional detach, and also thinking steel reinforcements for the bottom. I think it's a mistake (at least in my usage) to neglect the "truck-like" qualities of a hatch. The right boattail design could enhance the truck-like functionality rather than hinder it. (By truck-like functionality, I mean odd-size loads, not to exceed 200ish lbs in the tail.) A detachable side-latch hinge seems like a no-compromise design to me.
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