diesel fuel nozzle

I use both type of nozzles when filling the motor home. I have seen some truck island pumps labeled with a warning sign that says flow can be up to 60 gals per minute. If you have a 30 gal or less tank, that means you could fill your tank in 30 seconds or less. This is the reason many truck fueling stations have a separate lane and pump for truck and RV'S. Your paying for the product but they have to clean up overfills. Even if I am pumping 70 plus gallons with a large nozzle I go slow because the foaming action filling at a fast rate will cause fuel to spray out as the pump shuts off. I like the smaller / slower fill rates better.