I wouldn’t fuel with the big trucks… they pay more for crappier fuel.
At most mid-size truck stops the volume of diesel fuel delivered by large tankers and then pumped into vehicles,
per day, can easily exceed 10,000 gallons....And triple or quadruple that at the really large, busy truck stops. A busy truck stop will always have fresh, recently refined fuel, compared to a small, rural, independent gas station, where the diesel fuel might be relatively stagnant and could be sitting in those underground tanks for days or maybe even weeks!
In most cases the diesel pumps on the truck lanes and the diesel pumps (or combo pumps) on the RV/AUTO lanes are pulling fuel from the same underground tanks, but the nozzle sizes are different depending on which pump you are using.
The main difference is that there might be a sign on the pump, or overhead on the canopy, over one or two lanes, that says 'Auto Diesel' and these will normally have a smaller nozzle and a normal flow pump (about 10 gallons per minute) which is much easier to control when dispensing diesel into normal passenger vehicles, such as your average VW Passat or Dodge Diesel Dually or a Mercedes Benz Sprinter.
The truck lane diesel pumps almost always have a larger, much heavier, hi-flow nozzle (about 60 gallons per minute) that will flow a large amount of fuel in a hurry, typically 200-300 gallons in just a few minutes, which is fine for semi trucks, but very difficult to manage if you are trying to refill a normal passenger vehicle.
In my early days of trucking I was always advised to avoid fueling at a truck stop when you see the fuel tanker is dispensing fuel into the underground tanks. The thought was that in those days, the underground steel tanks were so full of rust and crud that the delivery would stir up the debris...and since you are pumping fuel into your truck at the same time, some of that debris is bound to end up in your fuel tanks!
But since almost all recent underground steel fuel storage tanks are lined with poly, or resin, or some other composite, and most dispensing pumps now have 2 or three inline filters, the chances of getting contaminated fuel thru any of the pumps is minimal.