Seems like there was one thread here on this that are quite old now.
Looking for a setup for both cars.
The BlackVue DR590-2CH looks promising. I like that you can add GPS to it as well. https://www.amazon.com/BlackVue-Dashcam-Starvis-Sensor-Channel/dp/B077W23BGS/ref=sr_1_5?s=automotive&ie=UTF8&qid=1522262321&sr=1-5&keywords=BlackVue+DR590
Someone else mentioned that they use two single channel cams (front and back). https://www.amazon.com/Wide-Angle-Dashboard-Vehicle-G-Sensor-Recording/dp/B0746CL6DB/ref=sr_1_1_sspa?s=electronics&ie=UTF8&qid=1522262133&sr=1-1-spons&keywords=DDPai+Mini2P+1440P&psc=1
Anyone have one they like or could recommend? @bing are you still using the old Blackview?