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I just saw one today on a street glide. I didn't know what it was and it looked funny. I didn't get to talk to the guy, I was in my truck coming up behind him at a stop light.
Looks like it may be a combination passenger backrest/luggage rack.
Aha!!!:
Introducing the first, truly multipurpose backrest and luggage rack system, available only from Kuryakyn. Once installed, no tools are needed for adjustments, making the switch from rider to passenger backrest a snap. Full adjustability will help you enjoy those longer rides and with the incorporated luggage rack, carrying all your stuff just got a whole lot easier.
Truly multi-purpose – provides driver or passenger backrest along with a convenient luggage rack that can be used in either position.
Sturdy aluminum main frame, steel folding luggage rack with rubber inserts, & comfortably padded backrest.
Extremely versatile – backrest converts from driver to passenger without tools in seconds.
Backrest pad is fully adjustable via stainless sliding rods with push-button locks & knurled threaded *****.
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