I'm not. They are existing data I am ripping and recoding. Im doing the collada trans-coding myself with a program I wrote.

I can modify the collada pretty freely if that would help.

I ended up having to force the textures to be shared at runtime. As i instance each object I submit it to this class which forces like named materials to be shared. Now dynamic batching works.

using UnityEngine;
using System.Collections.Generic;

public static class MaterialsCache  {
    static private Dictionary<string,Material> matDict = new Dictionary<string, Material>();
    public static void UsedSharedMaterials(GameObject obj){
       Renderer[] renderers = obj.GetComponentsInChildren<Renderer>();
       foreach(Renderer rend in renderers){
         Material mat = rend.material;
         if (matDict.ContainsKey(mat.name)){
          mat = matDict[mat.name];    
         } else {
          matDict[mat.name] = mat;    
         }
         rend.material=mat;
       }
    }

}