Detachable trailer coupling torn off

Hello, who has experienced this before, or who knows such a case???? Yesterday 05.06.2004 we picked up our niegel nagel new caravan about 10 meters in MG with a Volvo V 70 with removable trailer coupling. Super max trailer weight 1800 kg. Through MG right…left…high…down…braking…starting…… everything ok!!! After 50 kilometers on the highway (tempomat inside) look into the mirror and a set of my husband “Now he’s gone”. Shock, a look backwards and there he rolls. M uttersoulen alone direction guardrail!!! At the guardrail he came to stand after a few meters. a starter of 20,000,– € 4 hours old 50 km driven, a damage of approx. 10,000,– €. Great!!! Does anyone know about this??? Can someone tell us or help us, what the case law looks like??? The safety rope was attached to the clutch, but the hung yes on the trailer (the entire removable trailer coupling, lured, safety bar closed). r Trailer trailer is still covered by the factory with a red number but only liability. Do Volvo have to bear the damage or the car insurance or the caravan insurance? Is this a messy