If the truck was truly stolen (e.g. the facts as reported by the insurer are true and can be corrobarated), then the truck's insurer would not be responsible for the accident; and the truck's owner would not be responsible personally unless you can show the he was implicated in the theft (e.g. that he hired someone to steal the truck to commit insurance fraud). The simple fact is, owner and insurer are generally not responsible for accidents involving a stolen vehicle.You could try to sue whomever stole the truck, but since vehicle thieves often have little income or assets--and would not be covered by insurance during the course of their theft--this may not help; you could win the lawsuit but be unable to recover anything. This may, unfortunately, be a case where the victim does not have any effective recourse.