CarPlay USB extension cable

As long as it's not too long, sure. I've had 3-9 feet extensions on USB cables without issues. Even 25 foot active usb extensions are available.

 

Not sure if you really mean EXTENSION cable, as opposed to simply a longer SINGLE cable.

Just to be clear, an extension cable is one which has a female connector on one end and a male on the the other end. When using an extension cable you would need to use a standard lightning cable connected to the extension.

If that’s really what you mean, you’re generally better off with one cable of 10 ft, for example, than two combined cables adding up to 10 feet. Partially because you have a chance of added resistance from oxidation on the additional connectors with an extension

 

Right. The extension IS exactly what you need. And it should work fine. My preference for a single cable is a very minor one, which is not relevant when you have no choice, as in your case.