I have. In fact it was just inspected at a truck dealership.
It stands to reason that 18000 pounds requires a lot more effort than 2000 pounds.
Look, the only thing brakes can do is to stop the wheels from turning, and that applies to ALL vehicles.

How many of those big top heavy Urban assault vehicles do you see tits up in the ditch because the drivers have been lulled into a false sense of safety about their roadworthiness? Sure they will go when regular cars wont, but they don't stop a damn bit quicker, and their center of gravity is much higher making them more dangerous, not less.