How can I serialize an XML document with 2 different lists?

OK I'm using ASP MVC and am trying to load some XML data which I need to serialize as I'm converting it to JSON.

What I'm failing to understand is, my XML has more than one descendant. So, when I serialize it, in the model I need to store the data from each descendant in its own list right?

I've done that, so I've got two seperate lists. So, how can I serialize this all into the one XML doc?

This is an example of my XML markup:

<vehicle>
<make>Suzuki</make>
<color>Yellow></color>
<owner>
    <id>0</id>
    <name>Joe Bloggs</name>
</owner>
<owner>
    <id>1</id>
    <name>Foo Bar</name>
</owner>
</vehicle>

Here's my XML model:

    public partial class vehicle
    {
        private string makeField;
        private string colorField;

        private vehicleOwner[] ownerField;

        /// <remarks/>
        public string make {get; set;}

        /// <remarks/>
        public string color{get; set;}

        [System.Xml.Serialization.XmlElementAttribute("owner")]
        public vehicleOwner[] owner{ get; set;}

        // Keep this in a list to serialize it
        List<vehicle> vehicleList = new List<vehicle>();
    }

    /// <remarks/>
    [System.Xml.Serialization.XmlTypeAttribute(AnonymousType = true)]
    public partial class vehicleOwner
    {

        private int idField;

        private string nameField;


        /// <remarks/>
        public int id { get; set;}


        /// <remarks/>
        public string nameField {get; set;}


        // Stick it in a list so I can serialize it later
        List<vehicleOwner> vehicleOwnerList = new List<vehicleOwner>();
    }

}

So, now I have my two lists containing XML data: vehicleOwnerList and vehicleList. But these are all the one XML document. So how can I serialize this for both lists? Would I have to merge them into one list, and if so how would I do that?

So I.E.

 List<vehicleOwner> listCombinedActions = new List<vehicleOwner>();

                XmlDocument xmlDoc = new XmlDocument();
                XPathNavigator nav = xmlDoc.CreateNavigator();
                using (XmlWriter writer = nav.AppendChild())
                {
                    XmlSerializer ser = new XmlSerializer(typeof(List<vehicle>), new XmlRootAttribute("owner"));
                    ser.Serialize(writer, listCombinedActions);
                }

Cheers