Update - Diesel lane tips/advice

You have gotten some excellent advise on this thread. As you approach the TS look for signage and watch where the trucks are queuing up. At most it's very obvious how to approach the pumps but some are not. The idea about looking at one of the sat views available is an excellent one. If you have one of the pad devices, I recommend the Allstays Camp and RV app. It shows the locations of campgrounds of course but also Truck Stops, Walmarts and many other spots of interest to RVers. It provides links to each location and phone numbers. It also links to review sites.

Don't get pushed by the traffic around you to go faster than your comfort level. Enjoy the experience.