I'm guessing that you are encountering that splash problem when you fuel at the truck island, most newer trucks have a 4 inch inlet as opposed to the 2 inch filler neck on your bus, so tank venting is not a problem for them with high volume pumps. Try opening the cap on the other side of the tank/bus or watch the pump dial and when you get within 20 gallons or so of full ratchet back a couple of notches on the nozzle - 10 gallons a minute is too much fuel without a way for the tank to vent.
You'd never have this problem at the RV island of a FlyingJ all you need is an hour to spare while you fill up!