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you dont have to take my word for it.. but you should probably consider the hundreds of years and millions of miles of combined cycling experience of two of the biggest cycling communities on the net

trunk racks damage cars! you just cant hang a 20-30lbs bike on a 20 inch lever against paint without bad things happening sooner or later. i use my mazda for carrying the bike until i can come up with a hitch mount.
the straps blow back in the wind.. doesnt make a difference.