There are four types of vehicles in the Space virtual world platform;
Select the main mesh for your vehicle and add a collider.
Ensure the collider does not overlap with the wheels.
The wheels will have their own colliders applied by the Car Physics script and those colliders should not overlap the body collider.
You can adjust the collider size manually by clicking the Edit Collider button and grabbing the small green dot in the middle of each surface, or by entering size and position parameters in the Inspector.
Attach the Car Vehicle component to your vehicle.
This will add three scripts to the object;
Car Physics
Vehicle Rigid Body
Car Physics
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