The difference between grubby scratched grey or black cylinders at night, when raining, in blinding sun, under time constraints with a good level of fatigue etc, etc, etc…. It’s gunna happen.
As stated before, why not paint the cylinders green or the carts green (even easier), it will now be obvious at a great distance to all.
Talk to CASA & BOC, stop the holes in the cheese aligning now.