Samsung Galaxy Tab 2 10.1 Car Charger

This turns out to be more complicated than just the amperage rating of the power adapter.
This XDA post says that the Tablet itself may 'step down' to 0.5A charging if it cannot detect the right support in the USB host. There are some additional details in this post but I don't grok them.
That thread led me to .
I just verified some of this with my Samsung Galaxy Tab 10.1 and the no-name 2A USB wall charger I have. If I plug my tablet into this "unapproved" USB adapter, then I get a little red "x" on the battery charge indicator in the system tray. Additionally, I get the "media scanner running..." alert (which I think means that the Tablet thinks it might be connected to a computer). I cannot tell at what rate (2.5mA, 500mA, 2A, etc) the tablet is actually charging at, though.
If I plug the tablet into the 'approved' wall wart, I get no such red "x", nor any "media scanner" alerts.
All that said, in practice, I've found that the tablet will charge up on my no-name USB adapter. I'm not sure if that's because I tend to turn the screen off (and I don't have 3G), and thus the power draw of the sleeping tablet is less than the 500mA, or if its actually getting the full 2A.
I think the upshot is that any reputable wall charger or anything labeled as "compatible" with an iPhone or iPad will probably support the USB charging spec, and thus will fast-charge a Samsung Galaxy Tab. But I'm just guessing. It would be nice if there was an official USB logo or label for chargers that supported this mode ...
Verizon Vehicle Car Power Charger For Samsung Galaxy Tab SGH-i987 / SCH-i800 / SPH-P100 SGH-T849 / 7.0 Plus / 7.7 / 8.9 GT-P7310 / Note 10.1 / i905 / 10.1 GT-P7510 / Tab 2 10.1 (Carrier Packaging) Wireless (Verizon)
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Pwr+ Extra Long 5.5 Ft Cord Rapid 2A Car Charger Adapter for Samsung Galaxy Tab 2 7.0, 7.7, 7 Plus, 8.9, 10.1; Galaxy Note 10.1 inches P/N ETA-P11JBEGXAR ETA-P10JBEGSTA Tablet PC Tab Auto Power Cord Wireless (PWR+)
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Samsung 2Amp Vehicle Car Charger Power Adapter with Detachable Micro USB Charging Cable for Samsung Galaxy Tab 4 7.0, 8.0, 10.1 / Samsung Galaxy Tab Pro 8.4, 10.1 / Samsung Galaxy Tab 3 Kids (Bulk Packaging) Wireless (Samsung)
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Fosmon 2.1Amps / 10W Dual Port USB Rapid Car Charger for Samsung Galaxy Tab 2 10.1 Wireless (Fosmon)
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High Quality Travel Charger and Cable for Samsung Galaxy 7 8.9 10.1 inch Tab 2 Tablet, Home Wall Charger + USB Cable, BLACK Wireless (Kasonic)
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