Business Auto Coverage for Unscheduled Trailer

This question pertains to liability coverage afforded by the business auto policy. The insured was driving a covered auto (symbol 7) and was pulling a trailer that weighed over 6,500 pounds; the trailer is owned by the named insured, but is not scheduled on the policy. As the insured was taking a curve at excessive speed, he lost control of the vehicle and struck a guard rail. The impact with the guard rail caused the trailer to come loose and it then struck a vehicle coming from the opposite direction. Does the insured have liability coverage for this property damage claim?

Texas Subscriber