That is done 2 ways:
- by having a more explicit broker carrier contract
- by requiring that insurance certificates spell out the terms of that contract.
" Carrier shall procure and maintain at its sole cost or expense the following insurance coverages:
All Risk Broad Form Motor Truck Cargo Legal Liability Coverage in an amount not less that $100,000 per occurrence. The coverage provided under the policy shall have no exclusions or restrictions of any type that would forseeably preclude coverage relating to cargo claims including, but not limited to, exclusions for unattended or unattached trailers, theft, commodities transported under this Agreement, refrigeration breakdown or lack of refrigerator fuel."
This is about as good as you can do as a truck broker and you should require a certificate spelling out same.