I'm considering purchasing a new HU with Carplay for my car. As I've been researching alternatives I'm worried about the ability to charge my iphone while using Carplay. The usb connections in the HUs I've seen all charge at 1 amp and my experience has been that a 1 amp usb charger is unable to keep up with the battery drain when I'm running a nav app (like Waze) and also Pandora. I currently use a usb adapter rated at 2 amps. If these new Carplay HUs can keep up the battery on my iphone on a long trip, it severely limits the viability of Carplay for me. Any thoughts are appreciated.