I typically use Loves or Pilot(FlyingJ). If using my Comdata card, which is most of the time, I use the truck lanes. If I intend to use a Visa I will go through the RV lanes. Loves has better corp discount for using Comdata card than Pilot.

Only time I have to use a cashier is in Oregon, due to me not having a fuel permit, and not being able to get past that screen legally. You can put any number in the field, but risk a hefty fine for the state fuel taxes, better to just pay the tax as you go, if not buying a permit, but it requires seeing a cashier prior to pumping.