I am looking to install a trailer hitch for my new Q5. I will likely not ever pull a trailer (or very seldom); most of its use will be to mount a bike rack to carry a couple of bikes. There are several of them out there of varying prices and I am sure quality, including the one from Audi, which is over $800, while others are considerably less. Some require drilling to install, and trimming of the plastic bumper (ouch!). Can anyone recommend a good hitch that bolts up and doesn't require drilling and trimming of the bumper?