Hoping for some help on this one, I think it might be an easy one.

I have an @future REST API callout that just sends some data. (It works just fine)

I have 1 Opportunity with a check box, when checked, the API is called.
Master/Detail to Opportunity is Equipment__c.

I have/will have between 1 and 100 peices of equipment per Opportunity.

The below class works, except for the equipment part, instead of listing the unique equipment, it repeats the same peice of equipment over and over (If there are 3 unique pieces of equipment, it will repeat the same peice of equipment 3x. The debug log indicates the query worked fine and the equipment is there, but this peice is not doing what I want it to do.

    jsonObj.writeStartObject();
        jsonObj.writeFieldName('EquipmentList');
        jsonObj.writeStartArray();
            jsonObj.writeStartObject();
                jsonObj.writeStringField('SiteID', E[0].Id);
            jsonObj.writeEndObject();

        jsonObj.writeEndArray();
             jsonObj.writeEndObject();
            
Reults are:           
        {
          "EquipmentList": [
            {
              "SalesForcEquipmentID": "a0f18000001YetmAAC",
              "SalesForcCAID": "R1234567890",
              "SalesForcSmartCard": "S1234567890"
            }
          ]
        },
        {
          "EquipmentList": [
            {
              "SalesForcEquipmentID": "a0f18000001YetmAAC",
              "SalesForcCAID": "R1234567890",
              "SalesForcSmartCard": "S1234567890"
            }
          ]
        },
        {
          "EquipmentList": [
            {
              "SalesForcEquipmentID": "a0f18000001YetmAAC",
              "SalesForcCAID": "R1234567890",
              "SalesForcSmartCard": "S1234567890"
            }

Instead of:
        {
          "EquipmentList": [
            {
              "SalesForcEquipmentID": "a0f18000001YgrmAAD",
              "SalesForcCAID": "R2345678901",
              "SalesForcSmartCard": "S2345678901"
            }
          ]
        },
        {
          "EquipmentList": [
            {
              "SalesForcEquipmentID": "a0f18000001YlmmAAA",
              "SalesForcCAID": "R3456789012",
              "SalesForcSmartCard": "S3456789012"
            }
          ]
        },
        {
          "EquipmentList": [
            {
              "SalesForcEquipmentID": "a0f18000001YetmAAC",
              "SalesForcCAID": "R1234567890",
              "SalesForcSmartCard": "S1234567890"
            }            

            
Here is the class:
public class AmDocs_CalloutClass_BulkCreate {

    @future(callout=true)

    public static void AmDocsMakeCalloutCreateBulk(String Id) {

 list<Opportunity> O = [select id, Name, AmDocs_Site_Id__c from Opportunity where Id = :id ];
     
 list<Equipment__c> E = [select id, Opportunity__c from Equipment__c where Opportunity__c = :id ];

JSONGenerator jsonObj = JSON.createGenerator(true);
    jsonObj.writeStartObject();
    jsonObj.writeFieldName('CreateBulk');
    jsonObj.writeStartArray();
        jsonObj.writeStartObject();
        jsonObj.writeFieldName('Property / Site');
        jsonObj.writeStartArray();
            jsonObj.writeStartObject();
                jsonObj.writeStringField('SiteID', O[0].AmDocs_Site_Id__c);
                jsonObj.writeStringField('CustomerID', O[0].Name);
                jsonObj.writeStringField('SalesforceID', O[0].Id);
            jsonObj.writeEndObject();
            jsonObj.writeStartObject();
                jsonObj.writeFieldName('EquipmentList');
                jsonObj.writeStartArray();
                    jsonObj.writeStartObject();
                        jsonObj.writeStringField('SiteID', E[0].Id);
                    jsonObj.writeEndObject();
                jsonObj.writeEndArray();
           jsonObj.writeEndObject();
           jsonObj.writeEndArray();  
    jsonObj.writeEndObject();
    String finalJSON = jsonObj.getAsString();
   
        HttpRequest request = new HttpRequest();
            String endpoint = 'http://putsreq.com/KZ2kmwfUvrIf5ARJE05h';
                 request.setEndPoint(endpoint);        
                 request.setBody(jsonObj.getAsString());  
                 request.setHeader('Content-Type', 'application/json');
                 request.setMethod('POST');

         HttpResponse response = new HTTP().send(request);
                 System.debug(response.toString());
                 System.debug('STATUS:'+response.getStatus());
                 System.debug('STATUS_CODE:'+response.getStatusCode());
                 System.debug(response.getBody());
}
}

Thanks for your help.
Jerry