"Highway Diesel", "Truck Diesel" and "Diesel #2" are all EXACTLY the same thing. Only difference may be the sulfur amounts, depeneding on labels where you get your fuel. "Off highway diesel" is also the exact same thing, except it does not have tax(s) added to it, and is dyed pink. Because it's not taxed, it's not legal for use in cars, but intended for farm machines and generators etc. In rual places, where people have their own fuel tanks, sometimes inspectors will come around and dip in to fuel tanks to make sure dyed diesel isn't in their road cars.
The truck stop pumps are fun too. They do pump around 0.6-0.8Gal/sec. Normal pumps are 0.06-0.1Gal/sec. The guy who used to fill the 500gal tanks on the farm used to have a 1.1-1.5Gal/sec, much fun. But at truck stops I can fill my SD in under a minute.