None whatsoever. Example, my trailer has 5 compartments. I can legally haul 8850 gallons of gasoline to keep my total weight < 80,000 lbs.
I have been dispatched to deliver 5000 gallons of Marathon to one store and 3850 gallons of ExxonMobil to another. At the time of loading, I decide how to split up the 5000 gal of Marathon to load it. Usually takes up 3 compartments. When that product is loaded...I log out of the loading system and log back in to start a new transaction for the different brand. The other 2 compartments is where I split up the 3850 gal of EM gas.
I mark the compartments on my paperwork so I don't forget what product is loaded where. When I get to the Marathon destination, I know that I need to unload just those 3 specific compartments at that store. The other brand product goes to the other store.
State agencies are very strict about selling whatever brand is displayed on the sign or canopy above the pumps. If they get audited, and the delivery manifest shows a different brand than what the store is advertising....it's BIG trouble for the store owner AS WELL AS the fuel carrier.