Just a guess, but I bet the other end floats in the hole drilled in the bedside. If the hole is snug, the conduit shouldn't move too much. If required, a tie-wrap around the end under the bed will keep it from coming out. The springy ones for doors are only secured at one end.
Current fleet (subject to change w/o notice) \'49 GMC 3/4-Ton , 60 Austin Healey Frog-eye Sprite (some assembly required), 2011 Dodge Avenger, 2015 Jeep Cherokee. No, they don't all run. My other ride is a (B737)no, (B767)no, A320.... Update... was Embraer E190, now Boeing B787. Knowledge is a wonderful thing, but ignorance means you don't know you can't do something.
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