SimpleCarController tutorial make a car that jumps out of the scene.

Perhaps I missed something, but I tried following all the steps in Unity's Wheel Collider Tutorial, only to have a car that bounce and flips out of the physics boundaries. The video shows it very clearly. I'm assuming I just missed a step, or maybe the tutorial I went though is based on a parent link that includes some general start instructions I missed entirely.

What ever the case, following the tutorial to produce a drivable care makes on that acts like a jumping bean with no interaction.

https://docs.unity3d.com/Manual/WheelColliderTutorial.html

 

Your Root object needs a collider, it should be the size of the truck, its okay if the collider overlaps the wheel colliders.

 

Thanks that resolved it. NOTE: In response to your post, I first tried a mesh collider, which did not work, and then switched to adding 2 box colliders to cover the base body and bingo. Thanks.

 

A mesh collider must be marked as Convex to work as car collider.