RV and car pumps: Slow to fill, often multiple swipes on the CC and clueless people that park at the pump and go inside to get a sandwich, etc. May be the best place to get cash back on your CC.
Truck lanes: You may have to go inside to start the pump, fast fill, pull forward and go inside to pay. Pilot Frequent Fueler RV card (this is NOT the GS card) starts the pump and sets the price to 3 cents off of the cash price. Pay inside with Amex and get 5% cash back. Loves similar but no pump start.
I use both but I've never checked to see if I can get into the truck lanes, no need to check and you don't deal with clueless people.