I use a GoPro Hero5Black which I have in a housing bolted to my Tow Hook, which is screwed into the frame. The Tow hook attachment is made by the same firm that manufactured the Tow- hook. The waterproof housing was bought off e-Bay.
I use the GoPro remote to start and stop the video. I used to review the video post session after parking in the paddock, but with a larger volume memory card now in the camera, I just set it in the morning and forget it until I’m ready to go home, starting and stopping the camera as required.
After the day ends, I remove the camera, re latch the housing, and unscrew the tow hook.
I download the raw video off the card that evening, and therefore have an empty card for the next day. I spend snowy winter days editing the footage, and analyzing my mistakes.