Did a tanker driving training course some years back ... 10 ish ?? ... On a disused airfield with a pre-wrecked and battered tanker we had to do a few of the "NEVER DO THIS" things .. luckily it was only water inside .... and lots of cones on the "road"
1. Enter a roundabout too fast and brake hard whilst turning right .... all the liquid ends up above your left ear and the lost of control is almost instant ... couple of the lads actually half rolled it ... I just demolished an awful lot of cones ! Apparently 70% of tanker incidents are on roundabouts ??
2. Approaching a T junction brake hard, then accelerate, then brake again .... then hang on tight .. the "yoyo" effect of the liquid is somewhat amazing as you just slide across the ground
3. At a constant 56mph .. pull out to overtake a slower vehicle then pull straight back in whilst braking sharply (simulating that something has appeared to prevent the overtake) .. liquid now ends up over your right ear and you magically travel in to the oncoming lane ......
I decided there and then NOT to drive tankers unless very, very, empty ... and never did