Instead of throwing a bike and tying it down on your roof rack, see if you can maybe part with the stock luggage rack and get a Thule combination system. It has one setup for all of the accessories they offer, and there are a wide variety of accessories to fit whatever your need. The trailer hitch style racks are good, trouble is, you have to have a trailer hitch to attach it to, if you have one on the car. I would highly suggest the Thule roof rail and accessory system. It is the most diverse and easy system out there that I know of. Hope this helps!