The USB port in my truck only charges at 500ma. Beyond charging, there are a lot of benefits to using the integrated USB port. Better (uncompressed) sound transfer, deeper integration for better control, no lag in controls, and more information is displayed on the vehicle screen in comparison to using an external charger and BT. So I was hoping that someone may have come out with a charger that sits between your vehicles USB port and your phone. It would pass through the data pins between the vehicle and phone, but intercept and provide better charging on the power pins.