If you are looking for a complete vehicle physics package with WC3D included, check out NWH Vehicle Physics.
For setup instructions click here.
Wheel Controller 3D is a complete alternative to the Unity's inbuilt wheel collider. It allows for more realistic vehicle behavior, complete customization and 3D ground detection. No more “stick” wheels!
Features:
Wheel has width and length, not only a single point in the middle.
API with almost no differences from Unity's inbuilt WheelCollider - familiar and easily swappable.
Fully customizable via custom inspector. Adjust spring, damper, friction curves, geometry, etc.
Adjustable camber, caster and rim offset.
Pacejka friction model with support for different surfaces.
Friction preset system that uses ScriptableObjects for easy surface switching.
Adjustable at runtime.
Adjustable ground detection resolution with multi-threading for very low performance impact.
Can handle wheel visuals by itself (rotation and position).
Suitable for different kinds of vehicles: cars, trucks, motorcycles, tanks, etc.
0.03 ms of CPU time per frame for an average wheel.
Easy to set up.
C# source code included.
Try it out:
Windows -
MacOS - WebGL
More info:
YouTube - Forums - Setup Guide
Buy WheelController3D: Unity Asset Store