If you want to rig a big camera to a car, you need quite a bit of building to do so. But if all you want is to mount a small GoPro, here is a clever mounting way courtesy of Chadman108.
The mechanism is based on a tripod and three suction plates (pretty similar to Cineskates'CineSquid only with a tripod).
After removing a tripod's spike's they are replaced with mini ballheads attached to the mentioned suction plates via aluminum stock. The combination of variable length legs along with flexible-angled vacuum plates allows the tripod to rest in various positions covering almost any desired coverage of the car.
