Thanks for the feedback guys. Looks like the roof rack is the way to go. One of the local bike dealers has a big sale this weekend so my timing is perfect.

I do like to take my bikes camping and usually drive an hour or so for that. My roof rack on my Saab was always very stable, even on long trips.

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