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Explanation: The first reference below has a nice photo of the device about halfway down the page. You can see that it's not a single bar; it's more of a "support" or "rack" type thing. It apparently pulls out from underneath the bed (you grasp the bar mentioned in the context above and pull out as far as it will go).
Guys -- I'm sure you native speakers can look at this and come up with a nice, acceptable way to say it...please??!?