Every summer my dad likes to go on these epic months-long rides across America and Canada. He even started his YouTube channel Aleks Biker where he documents and narrates his crazy trips (in Russian language).
For last year's Father's day he asked me to take pics of him riding on local roads for the channel. So I recruited my girlfriend to drive the hatchback with an open rear door while I was hanging off the back with the camera, snapping pics. It proved to be a lot more difficult in practice than I imagined it. The biggest issue was keeping balance from rolling inside the car on all those twisty roads, but it was absolutely worth it.
Here is his setup with the handmade mirror mounts: