How do we report a truck or trailer that is empty but has racks that are IIT in ACE?

How do we report a truck or trailer that is empty but has racks that are IIT in ACE?

Select one of the following, as applicable, and report it at the conveyance/truck (if there is no equipment/trailer) or under the equipment/trailer level:


EC - Shipment consists of empty IITs covered by Carrier's bond
EI - Shipment consists of empty IITs covered by the Importer's bond
MC - Shipment consists of merchandise and IITs. IIT's covered by Carrier's bond 
MI - Shipment consists of merchandise and IITs. IIT's covered by Importer's bond