The main difference between the Administer Trailers and View trailers is with trailer creation and deletion.
A driver with Administer Trailers disabled will only be able to view and select trailers to attach to their vehicle.
They will not be able to create new trailers, edit existing trailers or remove trailers from the Drive app or the database.
Drivers without the 'Administer Trailers' should be able to attach trailers to their vehicle.
Let us know if you have any additional questions.