My old F-150 had only the regular USB plugs so I used the slow-charging USB to USB-C cables. Since the charge was so slow, I had a QC 3.0 adapter plugged in the cigarette lighter if I wanted to charge it up quickly but would not be able to use Android Auto.
When I saw that my new Silverado has USB-C plugs, I figured it was time to catch up and bought at least ten USB-C to USB-C cables. I also replaced all the USB plugs at home to USB-C. It's 2019, ya know?
Now, I can quickly charge my phone with Silverado's USB-C plugs and be on Android Auto at the same time. The regular USB now charges my LED flashlight. I'm glad Chevrolet didn't make it all USB-C, I think the regular USB has a good fifteen more years to go before becoming obsolete.
The regular USB can only go up to 2 or 3 watts, while USB-C can deliver up to 100 watts. My phone does up to 36 watts and I'm showing fast charging on my phone which is nice! No more deciding between two cables.
If you're not sure why there's USB-C in your truck, now you have your answer. You may need to buy a USB-C to USB-C cable to fully benefit from it.