I use a Mini 0801 in my car. It only has one camera, but you can swivel it. They are inexpensive, so if you wanted one in front and one in back, you could get one for each
http://www.amazon.com/E-PRANCE%C2%AE-Ambarella-Resolution-G-sensor-License/dp/B00F2GMUPU
On my motorcycle, I use a Mobius. Totally different form factor, but I really like it for my bike.
http://www.amazon.com/Mobius-Action-Camera-1080P-Sports/dp/B00GT2B4R6/ref=sr_1_1?ie=UTF8&qid=1427422684&sr=8-1&keywords=mobius