I don't doubt what you said theman, however the scenario you described may not be what usually happens in the real world. Yes, when there is a contract between a 3PL/shipper, and a carrier, usually the contract allows the carrier to move the freight on either his truck or another carrier who meets the same criteria as the original carrier i.e. insurance, driver selection, equipment maintenance, etc. etc. in other words, moving on another carriers equipment as if it was on the original carrier. What happens more often is a situation where I have given a shipment to ABC trucking and for whatever reason, they decide to give my shipment to XYZ trucking. I do not have a contract with ABC, just his insurance, authorities, WSIB, etc. I have nothing on file for XYZ and doubt if there is any contract between ABC and XYZ other than XYZ had a truck available. As a result, there would be no continuation of ABC's cargo insurance once the shipment is loaded onto XYZ's equipment. Once ABC gave the shipment to XYZ, in the eyes of their insurer, they relinquished their insurable interest in the shipment. Here is where the ugly part of double brokering occurs. My shipment, unbeknownst to me, is now in the hands of an unknown party, who I can only assume has proper insurance, WSIB, etc, all of the things I ask for as a professional load broker. So yes, in the civilized world of contracts and experienced transportation people on both sides of the transaction, no problem. In the Wild West that is the rest of the transportation industry, double brokering is something to be avoided.