Vinnie.
A O/O that is leased to a carrier, can broker a load if carrier permits, and run under that carriers authority. Load insurance can cover more than one shipment at a time. LTL folks do this all day long as well as many expediters.
In our case, if we put on more than one load, we have the appropriate insurance and the carrier is aware of what we are doing. Afterall, they are issuing the pro number, providing insurance, and collecting for that load.
My main point is this. A O/O can run for more then one company IF, that truck is insured in some way shape or form under that carrier's policy he/she is running the load for. The carrier's customer assumes that truck is under their policy in case an accident or claim the insurer will pay it. If that truck is not under that policy, the insurance company will not pay the claim. The customer has a contract with the carrier, not the driver.
If you broker a load from someone, your carrier approves the customer and you will be insured under say Panther's policy. But they are self insured so thats a whole other situation, but it gives them much more flexibility.
Now as we both know to insure a truck, it costs that carrier money to do so (if they are not self insured as most small companies are not). Do we all think these carriers are insuring every vehicle that hauls for them? Would a carrier's insurance Co. insure a truck for a day? I outlined several ways that could be done and if one of those ways are not followed and there is a claim there is two recourses if the insurance company will not pay for it. Pay cash...or that carrier will be taken to court and found liable the the damages.
I think your focusing more on if a O/O can broker a load while being leased to a carrier if the carrier permits. I am focusing more on the topic of the thread.. O/O pulling for multiple carriers, not brokering a load through the carrier they are leased to as you describe. I worked with Wally at Panther, I know how it works LOL.