I installed the Curt 114233 Class 1 trailer hitch with 1-1/4" receiver on my 2012 A6 2.0T Premium Plus, no Sport or S line package. Installation was pretty easy. You only have to remove the lower gray bumper fascia part, and you do have to trim a section out of it for the receiver. I haven't done any wiring because I just intend to use the hitch with a cargo carrier and bike rack for now.
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Kuat Transfer V2 Bike Rack
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The Kuat bike racks for 1.25" receivers are a bit strange in that the hitch pin hole is placed in between where a 1.25" or 2" hole would normally be so that it can be used with either sized receiver. However, this means the holes don't line up and a standard 1/2" hitch pin won't fit! You have to use their included 3/8" hitch pin, but it's really long so it can slide from side to side, the retaining clip only clips on the end and not through a hole, and you can't use a standard 1/2" locking hitch pin.
Luckily this MaxxHaul 50563 Threaded Hitch Locking Pin is thin enough to fit through the misaligned holes, and is also cheaper than the Kuat locking pin. You can just ignore the threaded part, or I put an M12 nylon lock nut on to stop the pin from sliding side to side, as shown in the photo. The other side is held by the retaining clip.
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