The GoPros power off miniusb plug, so it should be pretty easy to hard wire through the tower. I love my Hero3. I mounted mine to the bimini support and that worked good. The nice thing about the Hero3 is it has a wireless remote, so you can start and stop the video when people crash. It makes editing much easier. You can also run a WiFi mode on a tablet or smart phone that allows you to see what is recording and start and stop the recording. I considered getting a cheap 7 on tablet and using that like a towing mirror.
I plan to buy the rollbar mount and put the camera up on the tower by the wire connection, the hardwire the power.
The gopro also has HDMI output, so you can wire it into some video based stereos.
I will try to post some videos I took a couple weeks ago.
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2005 Canadian Blue Flake X10