Can RVers get the cash price for diesel at Flying J/Pilot?

I get 5% off with my pen fed card so that is better then the few cents off of the card. Go ask for a frequent fueled card. They had them for truckers I think too. Have to pump 500 gallons on the card before the auto start feature worked but that was easy to hit with a 200 gallon tank. I like the truck lanes as they are fast pumps but sometimes they are stacked up and then I hit the RV lanes.