Why Caravans Roll Over: and how to prevent it

Caravans and their tow-vehicles have a unique type of accident (jackknifing and rolling over). The cause is known and long understood. The rig is triggered from its intended stabilising characteristic (understeer) into seriously escalating unstabilising oversteer.

In conjunction with caravan and other issues, your tow vehicle's margin of understeer ultimately determines your rig's stability and especially how it will act in an emergency swerve at high speed.

If understeer is reduced to zero (...