How do you get an object to level out when floating?

Hello again, I have a floating script that I got off of here that works like a charm, just wondering, does anyone know of a way to make it so that an object floating will aline so that its largest surface is beneath? I know the engine can't detect that but if it was a variable I could change I wouldn't mind. Here's the floating code I have, and kudos to whomever made it:

    using UnityEngine;
 using System.Collections;

 public class Floater : MonoBehaviour {
  public float waterLevel, floatHeight;
  public Vector3 buoyancyCentreOffset;
  public float bounceDamp;
  
  
 
  void FixedUpdate () {
  Vector3 actionPoint = transform.position + transform.TransformDirection(buoyancyCentreOffset);
  float forceFactor = 1f - ((actionPoint.y - waterLevel) / floatHeight);
  
  if (forceFactor > 0f) {
  Vector3 uplift = -Physics.gravity * (forceFactor - rigidbody.velocity.y * bounceDamp);
  rigidbody.AddForceAtPosition(uplift, actionPoint);
  }
  }
 }

It's C# and normally I prefer javascript but I'm not good enough to convert it :/ Thanks.