I'd extend Jack's idea even further, with what you might call the TransformerTopper(TM). Takes a bunch of hinges & latches. There's a frame around the cab, and a central beam going back to the tailgate. The two sides are sort of clamshells that hinge to the beam and latch to the sides & tailgate. Either side can lift to put in small stuff, and can easily be unhooked from the beam, and they're light enough for one person to handle. Remove the two sides, and the beam can then be removed (and maybe the frame at the cab, too) so you have a standard open pickup.
Now the transformer part is that the clamshells & beam also hinge crossways, so the topper can be opened as a lid from the tailgate, hingeing about halfway back along the bed.
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