I do not have a hitch currently. I have had roof racks on my previous vehicles. They work great but they decrease mpg and any highway driving in the summer will leave your bikes littered with bugs. I am not against the idea of adding a hitch in order to install a hitch mount rack.

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2004 BMW X5 3.0i - Mine
2011 BMW 328i xDrive - Hers
2002 BMW 325xi - waiting for a new owner