Another option is to join Pioneer Fuel (
Link to Web Site or their other name, Pacific Pride. This series of stations are fuel stops only, no facilities, and designed for 18 wheelers. Usually they have good access, wide aisles and plenty of room to maneuver. You sign up and give them a bank account to draft. Then, once a month they send you a bill and draw the funds from your bank account. The only problem is that they don't publish their prices. You can call and check before filling, but I have found them to be slightly less than the truck stops' prices.
A lot of us out here use Pioneer Fuel/Pacific Pride. The only problem is that they don't have a lot of stations to serve us. Their web site gives you the addresses of their locations.