jd620, These folks and other firms serve the trucking industry that is constrained to fueling at Truck Stops taking on 150 to 300 gallons at a time. Their clients can not fit into the stations you use, do not want to fuel with a car sized despenser and be cut off at $100 or $150 of fuel. My EFS card is good for up to a $800 purchase at 60 gallons per minute flow rate.
But if you have a Prevost pulling a stacker trailer, you might be interested. Which says, the RV market is a tiny part of their business.
Hope this helps. All the best.