[Italianoleone]

Which one have you tried that supports fast charging?

Should the dual charger have one USB-C and one USB-A output or two USB-A's?

[HOTDAWG]

Not much help, but an observation:
The only charger I have tried in the car is the USB-c cord straight into my car's USB port.
The phone gets scary hot, and isn't really useable whole plugged in - laggy, apps don't want to respond. Must be something about the port.
You might want to check if your phone and car get along before purchasing any charger.