Just found this ACF-Brill Trolley bus, and I think this might be able to confirm a model name:
http://www.imcdb.org/vehicle.php?id=5599

This Chevy's a 3100:
http://www.imcdb.org/vehicle.php?id=381380


And this RTS bus, apparently owned by LACMTA was identified too:
http://www.imcdb.org/vehicle.php?id=383670