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You may consider using roller ball bearing drawer slides used for cabinet drawers, for example “Grass 650mm Full Extension Ball Bearing Drawer Slides” are available for $15 a pair, and they open 25+ inches. Two sets of those on the bed rails would be a sturdy attachment, and then just provide a catch to keep it shut while driving. A padlock type of clasp to hold it closed may be a good idea, it would keep the curious minds away.
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