How to tilt NavMeshAgent?

Hi there!

So everyone knows it is pretty easy to tilt an object, but how to tilt a NavMeshAgent?

I want the Agent to tilt 20 degrees on Z axis when he hits a tag as seen in this script:

 using UnityEngine;
 using System.Collections;
 
 public class AItilter : MonoBehaviour {
     public float z;
     
 
     // Use this for initialization
     void Start() {
 
     }
 
     // Update is called once per frame
     void Update() {
     }
 
     void OnTriggerEnter(Collider other)
     { 
         if (other.gameObject.CompareTag("lowrightturn"))
         {
             z += Time.deltaTime * 5;
             transform.rotation = Quaternion.Euler(0, 0, z);
 
         }
     }
 }

However when he hits the tag all he does is spin around and continue. Also I noticed that when tilting the Agent manually in the editor, it doesn't tilt! AND when changing the surface he walks on to being tilted, he goes upright. So apparently I can't tilt while using Unity's AI?

Please help! Thank you so much!