Originally Posted by Radiation Joe
There is a safety issue with using a single headrest mount. The end of the mount can be dangerous in a crash. I suggest mounting to the driver's seat to limit the chance of impacting the end of the mount. I use a cruise cam that mounts to both seats so there is no exposed end.
Only problem with drivers side, is that you need to be able to adjust the seat height/angle to get a good view out the window. The best position is high seat facing slightly forward, not the best angle for a driver.
I made the same hack (square aluminum tube) as shown above.
I also picked up a canon Powershot 850IS digicam on craigslist for $100, great video and the optical image stabilization is a real plus.