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 (or minus) the tow vehicle will oversteer. If not corrected in time the rig may jackknife, especially at high speed.Why Caravans Roll Over examines causes of caravan roll over in detail and in plain English. It provides ways to evaluate and improve the safety of your own rig. It identifies high risk situations and gives clear advice about how to avoid the dangers that are very much a part of towing a caravan.