Wages when being paid by percentage as a company driver?

When a trucking company pays their company driver a percentage pay, do they by federal law have to show the driver what the billable rate to the customer is? I know when I was a O/O they had to because of the contract. I am fully aware l am no longer paid the FSC. If the company does not want to answer or ignores that question (fishy), do I have the right to ask the customer? If they do by law have to provide that information, where do I find that at besides hear say? I really need to find that actual statue number. Company is located in N.C.

FYI background info. This is not general freight, zero brokers involved. I haul a pressurized tanker and see these customers consistently. I have been with these customers for many years and most became friends with on a personal level. My old company was bought out and this new one has caused a lot of damage.

Thank you in advance everyone.