If you are in Arizona, the pickups do not need to pay a 40 cent per gallon road tax, so you are better off fueling in the gas station section made for cars.
The truck stops normally have a 1.25" diameter fuel filler, designed to put out a minimum of 15 gallons per minute. If you have a pair of 150 gallon tanks, you don't want to wait for it to fill at the car rate of 8 gallons per minute, but instead fill up at 15 GPM per filler nozzle! Twin nozzles are the normal for truck filling stations! They can take on about 300 gallons in 10 minutes!
Your truck probably does not have the ability to insert a 1.25" diameter filler. It probably also has a bend in the filler line, and would not be able to accept 12 GPM or more! So you might be able to use some fillers, but not most.
I hear your pain! I was thinking of getting a F-450 as a retirement fifth wheel puller! Then in addition to the standard 40 gallon rear tank, I wanted to install a under the cab 53 gallon tank, so I could tow for about 900 miles without ever towing the trailer into the gas station! I could fill while the trailer is in a campground, or when the price is REALLY reasonable!
Depending on your tank size, you might consider a replacement tank?? Some 50 gallon in the bed fuel tanks can be filled at 15 GMP in the truck stops. IF that is enough fuel for you, then just fill the in the bed tank, as you leave the station, it will fill your main tank as you drive!
I would rather have my bed open to store whatever. . .
Good luck,
Fred.