So find it for us already!
In the meantime, if you drive your car on a public road, without a driver's license, and you get stopped by a police officer, you'll end up in the crowbar hotel, even if you show him a copy of the SCOTUS case. And, the judge at your trial will find you guilty and fine you anyway. He might even tell you that you have the right to appeal his decision. Good luck!
The State does not own the cars. We have given the State the power to "register" vehicles because they are high-value property which are frequently the targets of criminal actions. The title is your proof of ownership, just like a deed to property. The vehicle is "titled" in a specific state because enforecement of property crimes is a state controled issue.
And yes, find that case for us.