What warning does the driver of a petrol tanker have that 'rear wheel lift' is about to become 'roll-over'? What warning does the driver of a petrol tanker have that 'rear wheel lift' is about to become 'roll-over'?

• Possible answers:

   
• A. The steering becomes heavy
• B. The driver has very little warning
• C. The air pressure drops
• D. The diff-lock engages