Saris Bones 2. It mounts with straps like the Allen but the arms are more adjustable and I imagine it will fit almost anything I will ever drive. The trunks of my Civic and Accord though will hold a bike with the wheels off and that is usually what I do as it is more secure if I want to stop somewhere and eat, go shopping, etc.
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"It is the unknown around the corner that turns my wheels." -- Heinz Stücke