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As long you fold the back seat and remove the front wheel, you can carry any type and size of bike.
When making a long trip, I put my two bikes inside the trunk, after wrapping then with a blanket.
For short trips, or when arrive at destination, I use a bike rack (Quik Rack Mach2) which has two folding racks.
The two racks can fit folded inside the trunk when not in use. I install one or two racks depending of my need.