In motor carrier/trucking terminology, liability coverage while a truck is
operated with an attached empty trailer that is not hauling cargo (i.e.,
deadheading) or without any trailer (i.e., bobtailing), regardless of whether
the truck is dispatched or not. Often used interchangeably with
"bobtail" or "non-trucking liability," but unladen
liability has a broader scope since it includes both liability for deadheading
or bobtailing regardless of dispatch status.