The truck stops usually have an RV lane for you to use. The pumps dispense diesel and DEF and at a much higher flow rate than the pumps for cars. I like the Shell stations that now sell diesel at the auto gas pumps as they now have DEF with smaller nozzles that work better for pickup tanks and filler caps and the diesel price is the same.
More important to avoid times with heavy traffic at the pumps as you will have a more difficult getting in and out again and that applies to both auto gas stations and truck stops.
