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The beds are easy to take off. I just drench any nutplates I can get to with penetrant and have at it.
You could just pull your bed, or pull it and leave two bolts holding it, drive to the location of the new bed, and set the new bed it on the chassis to check. If it fits, bolt it down and drive off. Use anti-seize on the bolts. The bed bolts are 5.0 Torx.