Help With Camera rotation on X and Y Axis (Target Focused)

Hey so im trying to develop a camera that works similar to PotBS (Pirates of the Burning Sea) or ETS/ATS (Truck Simulators). So far I have it so the camera can zoom in and out and rotate around the object no problem. I am having trouble however when I add another axis. I tried adding a separate game object within the object im looking at so that I could assign the two separate axis to look at a different object but not sure if it helped.

So when I move the mouse left or right, its works great and I can rotate around no probs, but the Y axis is bugging out! I would alos like to implement so limits as to how 'High' the camera can go and also stop it from going below. Heres what I have so far

 using UnityEngine;
 using System.Collections;
 
 public class PlayerCamera : MonoBehaviour {
 
     public Transform target = null;
     public Transform target2 = null;
     int degrees = 10;
 
     private Vector3 tempPos;
     private Vector3 tempRot;
 
     // Zoom settings
     private float minFov = 15f;
     private float maxFov = 90f;
     private float sensitivity = 30f;
 
     // Use this for initialization
     void Start () 
     {
         
     }
     
     // Update is called once per frame
     void LateUpdate ()
     {
         if (target != null) {
             transform.LookAt (target.transform);
         }
             
         if (Input.GetMouseButton (2)) {
 
             transform.RotateAround (target.position, Vector3.up, Input.GetAxis ("Mouse X") * degrees);
             transform.RotateAround (target2.position, -Vector3.right, Input.GetAxis ("Mouse Y") * degrees);
 
             tempPos = transform.position;
             tempRot = transform.rotation.eulerAngles;
 
             transform.eulerAngles = new Vector3 (tempRot.x, tempRot.y, tempRot.z);
             transform.LookAt (target.transform);
 
             if (tempPos.y < 3) {
 
                 tempPos.y = 3;
             }
             transform.position = tempPos;
             transform.LookAt (target.transform);
         }
 
         float fov = Camera.main.fieldOfView;
         fov -= Input.GetAxis("Mouse ScrollWheel") * sensitivity;
         fov = Mathf.Clamp(fov, minFov, maxFov);
         Camera.main.fieldOfView = fov;
     }
 }