If you are looking for a complete vehicle physics package with WC3D included, check out NWH Vehicle Physics.

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 setup.

• Adjustable at runtime.

• Adjustable ground detection resolution with multi-threading for very low performance impact (Unity 2018.2 and newer required).

• Can handle wheel visuals by itself (rotation and position).

• Suitable for different kinds of vehicles: cars, trucks, motorcycles, tanks, etc.

• Easy to set up.

• 0.03 ms of CPU time per frame for an average wheel.

• Full C# source code included.

Try it out:

Windows

MacOS

WebGL

More info:

YouTube Channel - Forums - Wiki