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Disconnect the two wiring harness connectors at the rear of the bed.
Remove the screws that fasten the gas filler door assembly to the bed.
Remove the hose clamp that fastens the fuel filler hose to the bottom of the bed.
Remove the eight bolts that hold the bed to the frame. You might find it easier just to cut the bolts off with a hi-speed angle grinder e/w a cut-off wheel.
Get a six-pack to bribe three big friends to help you lift the bed up off the frame.