Slitherine

Whenever you want to rename a unit with transport you can only rename the transport.
It doesn't matter if you try to rename the unit on map or in the force list.
I think this worked OK pre-KM.

Transport and its content are the same unit, just with a different unit type assigned. The custom name applies to the unit, not the unit type.

OK, so renaming the transport will also rename the transported unit.
It was a bit confusing since earlier the name of the unit transported would be displayed, not the transport name.

Yep, the unit and its transport receive the same custom name then.