You would do excellent transporting nitroglycerin over washboard [1] [2]! [1] https://en.wikipedia.org/wiki/Washboarding https://en.wikipedia.org/wiki/Washboar

You would do excellent transporting nitroglycerin over washboard [1] [2]! [1] https://en.wikipedia.org/wiki/Washboarding https://en.wikipedia.org/wiki/Washboarding [2] https://en.wikipedia.org/wiki/The_Wages_of_Fear https://en.wikipedia.org/wiki/The_Wages_of_Fear . The protagonist drove a load of nitroglycerin over washboard by going fast enough to float over the bumps.