Panther found the loads for me. But it does work the other way. C.H. Robinson is an authorized Panther "backhaul" broker. I have never used their load board for a load though.
I have used them occasionally to supplement a load on the truck. Mostly ltl but some actually has pretty decent rates. Like Moot, we book them through Panther. Panther drivers have access to their freight either through a broker or their website.
The reason I ask is a few LS owners use them to book loads through one agent and LS has some sort of contract with them to cover loads like FedEx does.