Cubeの子にWheelColliderを自動生成して走らせる的な

Wheel

using UnityEngine;
using System.Collections;

public class Wheel : MonoBehaviour {
	public GameObject root;
	public float wheelRadius;
	public float steerAngle;
	public float brakeTorque;
	public float motorTorque;

	private WheelCollider FR;
	private WheelCollider FL;
	private WheelCollider RR;
	private WheelCollider RL;
	// Use this for initialization
	void Awake() {
		GameObject wheel = new GameObject("Wheel");
		wheel.transform.parent = root.transform;
		wheel.transform.position = root.transform.position;
		Vector3 scale = wheel.transform.lossyScale;
		Vector3 ofsX = wheel.transform.right * scale.x/2;
		Vector3 ofsY = wheel.transform.up * scale.y/2;
		Vector3 ofsZ = wheel.transform.forward * scale.z/2;
		Vector3 position = wheel.transform.position;

		FR = MakeWheel("FR",position+ofsX-ofsY+ofsZ,wheel);
		FL = MakeWheel("FL",position-ofsX-ofsY+ofsZ,wheel);
		RR = MakeWheel("RR",position+ofsX-ofsY-ofsZ,wheel);
		RL = MakeWheel("RL",position-ofsX-ofsY-ofsZ,wheel);
	}
	
	// Update is called once per frame
	void FixedUpdate () {
		float h = Input.GetAxisRaw("Horizontal");
		float v = Input.GetAxisRaw("Vertical");

		RR.motorTorque = v * motorTorque;
		RL.motorTorque = v * motorTorque;
		FL.steerAngle = h * steerAngle;
		FR.steerAngle = h * steerAngle;

		if(Input.GetButton("Jump"))
		{
			RR.brakeTorque = brakeTorque;
			RL.brakeTorque = brakeTorque;
		}
		else
		{
			RR.brakeTorque = 0;
			RL.brakeTorque = 0;

		}

	}

	WheelCollider MakeWheel(string name, Vector3 potision, GameObject parent)
	{
		GameObject obj = new GameObject(name);
		obj.transform.parent = parent.transform;
		obj.AddComponent<WheelCollider>();
		obj.transform.position = potision;
		WheelCollider wc = obj.GetComponent<WheelCollider>();
		wc.radius = wheelRadius;
		return wc;
	}
}