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

jmckelvy wrote:
I usually use the auto lanes. I swipe my MC then swipe my RV Rewards card. I get diesel for 3 cents (I think) off the cash price. The RV Rewards card is NOT a charge card and is free.

Everything I can find about the RV Rewards cards is that you have to be a Good Sam member now to get one. I would like to find a way to get the cash price at the truck pumps without being a Good Sam member.

I want to use a credit card because I get 5% back plus I am NOT carrying $2000 in cash for fuel.