Well before you go making any assumptions, on long cruises on the 401 i find myself drifting in the 150 over zone while not meaning too. Recently i find that the flow of traffic has slowed comparitively but still remains in the 150 area once you leave the GTA. I dont think its completely fair to immediately assume the worst of the driver.
At the same time, its important to be extra cautious of speeding now.
On a more optimistic note, +1 on the flatbed.