With KmlLayer I get a status: FETCH_ERROR, on your server, not sure why: http://www.geocodezip.com/v3_GoogleEx_layer-kml_linktoB.html?filename=http://www.la2ba.com/interface/LA2BA.kmz
It works if I put a local copy on my server: http://www.geocodezip.com/v3_GoogleEx_layer-kml_linktoB.html?filename=http://www.geocodezip.com/geoxml3_test/LA2BA.kmz
and it seems to work OK with geoxml3 (the local copy): http://www.geocodezip.com/geoxml3_test/v3_geoxml3_kmztest_linktoB.html?filename=http://www.geocodezip.com/geoxml3_test/LA2BA.kmz