I recently got to review Mpow Dual USB Port Car Charger and yes you can charge two Ipads or smart phones at the same time and at a faster speed in your car when you are traveling. When it is fully charged you will see a green light and automatically stops as well. Some other features it has is High quality fire proof material & anti-oxidation aluminum pull tab, makes no radio loss in your car or effect to Bluetooth or Wi-Fi devices. Safely protect devices and charger from overheated: Mpow dual usb ports car charger will automatically stops working when over current or over voltage is detected, switch to minimal charging current when battery is full. With the high charging efficiency of over 85%, the charger itself never get hot. This is so small fitting easily in the palm of your hand.
My Opinion: I think this is a great idea as when you are traveling you need to keep the kids busy and quiet. The size is so easy and accessible to take anywhere. I really like it.
To learn more visit http://www.xmpow.com/category/product/others/usb-chargers
They have so many different charging options from car to home.
Where to Buy? On Amazon
Disclaimer: I was in no way compensated for this review and this is solely my own opinion which may differ from yours.