i wouldn't say that if you have a flat on duals, you'll be "blowing by". you'll ruin the tire and possibly shread it to the point of having the steel belts all wrapped around the wheel/drum/axle.
a more correct statement would be something like "slowly limp to a truck stop."
"blowing by" with a flat and 50k+ lbs. of load would be quite unsafe, especially if you lost another on the same side.
thanks digger, i'll try to link something :drinkup