Car keeps bouncing randomly with 'Stabilizer Bars' code

Unity Engine
1

I have no idea what’s going on, my car just bounces up dramatically for seemingly no reason when I have this code on:

public class StabilizerBars : MonoBehaviour {

    WheelCollider FL, FR, BL, BR;
    float AntiWheelForce = 200;
    public float TravelL = 1.0f;
    public float TravelR = 1.0f;
    public float AntiRollForce;

    // Use this for initialization
    void Start () {
        FL = GameObject.Find ("Wheel_FL").GetComponent<WheelCollider>();
        FR = GameObject.Find ("Wheel_FR").GetComponent<WheelCollider>();
  
        BL = GameObject.Find ("Wheel_BL").GetComponent<WheelCollider>();
        BR = GameObject.Find ("Wheel_BR").GetComponent<WheelCollider>();
    }
    // Update is called once per frame
    void Update () {
        WheelHit hit;
        bool GroundL = FL.GetGroundHit(out hit);
        bool GroundR = FR.GetGroundHit(out hit);

        if (GroundL) {
                        TravelL = (-FL.transform.InverseTransformPoint (hit.point).y - FL.radius) / FL.suspensionDistance;
                }
        if (GroundR) {
            TravelR = (-FR.transform.InverseTransformPoint(hit.point).y - FR.radius) / FR.suspensionDistance;
        }

        AntiRollForce = (TravelL - TravelR) * AntiWheelForce;

  
        print (AntiRollForce);

        if (GroundL) {
            gameObject.rigidbody.AddForceAtPosition(
                FL.transform.up * -AntiRollForce,
                FL.transform.position);
                }
        if (GroundR) {
            gameObject.rigidbody.AddForceAtPosition(
                FR.transform.up * AntiRollForce,
                FR.transform.position);
        }

    }
}

It also doesn’t stablize the car at all.
For now it’s only enabled for the front wheels. I made it do the back wheels earlier and the same thing happened.
Does anyone know why this happens?

2

Does it work any better if you do it in the FixedUpdate method instead of Update

3

No, it seems to do the same thing.

Edit: Actually, yeah it seems to be doing something now after I apply it to the back wheels as well.
It’s still bouncing, though. I can’t really tell why it’s doing it.

4

I am still having this problem, my car acts exactly as it did without the stabilizers (it easily rolls over), except now it has even less stabilization with the random popping.

I set AntiRollForce to print so I could see what was happening, it stays at values lower than 0.001 and then randomly spikes up to the hundreds. I have no idea what to do.