The insured is the transporter.
The insured has no direct insurable interest in the goods but can insure their liability to the goods owner for loss / damage to the goods caused by the transporter's fault / negligence in terms of the STCs or agreed contractual agreements.
Basically, a third-party liability insurance policy in respect of the goods being carried.
No sub-contractors liability is covered.
First Loss policy - i.e.: no average applicable.
Transporter MUST operate on Standard Trading conditions (STCs) / agreed contractual agreements which must be supplied to and agreed by Insurers at quote stage.
No Standard Trading Conditions / agreed contractual agreement = no carriers liability cover!