mrchips1 :
I get a 4G signal with both the iPod and the iPad Pro
How? Hard drive based iPods don't have Wifi signals or 3G/4G signals, and the last iPod touch models only had Wifi based connectivity.
The iPad Pro probably could if it has a strong 4G signal, you could try connecting it to the car via Bluetooth and see what happens, but it's possible that most car electronics will only see that it's not an iPhone and therefore won't recognize it. Car electronics are about the most basic machines out there.