jakethesnake:
PS I drove petrol tankers in London for many years by the way.
That’s nice, I drove milk tankers. Do you know what the difference between a petrol tanker and a milk tanker is? Yours has baffles and typically several compartments to prevent the fuel sloshing about. Milk tankers have NO baffles and are often one or two compartments so you have 20,000+ litres sloshing about with no baffles to slow it down unlike your petrol tanker.