I previously built a tripod car mount, but I was disapointed with the high angle/limited angles I could obtain with it. Also, it wasn't very stable.
So, after some research I came across the Australian Cinesaddle from the makers of Cinekinetic. They are priced at $370. I'm no fool because the cinesaddle is pretty much a beanbag that comes with a "mounting kit" (nylon rope and stirrups). It was very easy to make, and the bill came to around $50.
Disregard the blown out shots as this is just a test.