How do i tell the camera to only follow the gameObject x orientation

Hello everyone beginner here, i am working on the moving vehicle challenge and i could make the camera follow the truck and also could make the camera switch between views (driver view/back view) the problem is when i switch to back view the initial x rotation for the camera is set to 0 so i want the camera to follow the player x orientation when in driver view so i don't lose the back view orientation, you can see my code below and the link for the project package here, Thank you

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class FollowPlayer : MonoBehaviour
 {
     //Player GameObject variable (the vehicle)
     public GameObject player;
     //Fixing the camera vertical position
     private Vector3 offset = new Vector3(0, 5, -7);
     private Vector3 offset2 = new Vector3(0, 2.5f, 0.3f);
     private int currentTarget;
     public bool camController;
     // Start is called before the first frame update
     void Start()
     {
         
     }
 
     // Update is called once per frame
     void LateUpdate()
     {
         camController = Input.GetButtonDown("Fire1");
         if (camController) { 
             if (offset == offset2)
             {
                 currentTarget = 2;
                 
             } else
             {
                 currentTarget = 1;
                
             }
  
             switch(currentTarget)
             {
                 case 1:
                     offset = offset2;
                     break;
                 case 2:
                     offset = new Vector3(0, 5, -7);
                     break;
             }
         }
         //Offset the camera behind the player by adding to the player's position
         transform.position = player.transform.position + offset;
         transform.rotation = player.transform.rotation;
         Debug.Log(camController);
     }
 }