I would just add on an additional cigarette lighter behind the dash by tapping into the existing cigarette lighter wiring then use one of these:
White Universal 12 Volt USB Car Charger for Apple iPod or USB Charging Device
I would just add on an additional cigarette lighter behind the dash by tapping into the existing cigarette lighter wiring then use one of these:
White Universal 12 Volt USB Car Charger for Apple iPod or USB Charging Device