I've looked closely at the "extra wheel" and think it would work just fine for my next tour because I need to pack a little extra food and water. My only concern is how it is attached to a bicycle. From pictures, it seems to be attached by the rear wheel hub "quick release". If that is the case, how does it pivot up and down without loosening the hub? I have extra bike frames, and am considering using them to make my own and attaching the pivot points to the frame similar to a kick stand mount rather than using the hub assembly. I also have extra rear bike racks which I would mount to the extra wheel rather than use the sling system.....any comments, pro or con, will be appreciated, thanks.