I am currently in-progress on a stunt car racing game. I have positioned my main game camera where I want it behind the vehicle and applied the default SmoothFollow script to it. I created an empty game object near the rear of the vehicle and made this the transform that the camera targets for the SmoothFollow. When I make turns around corners the car appears to stutter (or it’s the camera’s movement stuttering?), but I’ve double checked the Wheel Collider settings, the physics settings, the framerate and have deduced this is something happening from the camera follow script. Any help as to why this might be happening would be awesome! 
Is there any chance you can post the car code?
I had similar problems with SmoothFollow, camera was jittering in fast changes of its height (problem was only in fast increase of Y+ or Y-).
What I made is that I removed Time.time multiple value in heigh damper…nothing changed, but problem is solved. I don’t know exactly if you have similar issue, but maybe this can be helpful. 
Hey guys I actually solved this by checking “interpolate” to on within the rigidbody.