Display Equipment on Carrier Portal

Hi All,

I am working on carrier portal and one requirement is to display all the trailers dropped by carrier in our locations. These trailers could be used by shipments or some could even be lying on the facility but not yet loaded or identified for which shipment these trailer will be used.

I can display trailer number which are used for shipment on carrier portal.
But I am struggling to displaying trailers which are not used.
Any ideas on it is really appreciated.

Thanks a lot.
Mukul