Here is a method of transporting a human powered recumbent tadpole tricycle on a Chevrolet Volt car. This appears to be a Challenge Alize trike.
Visit the Challenge website and see the Alize trike HERE.
By the way, I have no further information about the rack. These photos were sent to me by Dave Beck, a friend who owns a Chevy Volt, thus his interest of cars meshed here with my interest of trikes, and now you know what I know. If you know more, please comment on this post. Who makes this rack? Is it custom or production?