I have a load info sheet that I designed, on which I list all pertinent info: pay per mile, load miles, deadhead, fuel surcharge, extra pay (tolls, DH, etc) which I send to the truck owner with the weekly paperwork. He pays 100% FS, 60% load pay, and the extras according to who has to pay the basic costs: DH to me, tolls to him.
LDB says it clearer, but that's the basic idea: clear communication, and fairness.