So far I was always very skeptical about double Chargers. I once had such and it just did not hold the Versprechunge, by the producer.
Now I have been very pleasantly surprised by the AmazonBasics Dual USB car charger.
It really provides enough power, naturally enough, a short drive from no to an empty device to fully charge, but for long distances, it is a great thing. In our forthcoming fourteen hours drive in the holidays it is guaranteed to be very helpful. Thus Juniot need to stop worrying about his empty Ipod battery and the drive is guaranteed relaxed.