The reVIVE II Dual USB Car Charger from Scosche allows you to charge your iPad and another device while travelling by car. The reVIVE II has a 2.1A USB port for charging your iPad. There’s also a second 1A USB port to charge another device simulataneously. The reVIVE II Dual USB Car Charger is $24.99 from Scosche.
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That is something that I think all of these chargers should do. More amps will not harm the device, but if the device is made right, it can use more then the 500MA normal USB provides.