I have been working on a spare tire holder for my A3, I took the hummer mount design and up sized everything of course. Not only does it swing out but it swings down to ground by means of a air ram. When tire is in up position there is a lock/ stop to support it just in case the ram has a problem or air line. Bearing are the key to it I used spindles for J.D. disk easy to get and cheap. still working on valving tire goes up to fast need to change valving, a little geometry on ram and find a heavy duty swivel for air line when swinging out. will post pics as soon as work gives me some spare time to finish.