You should contact his carrier as soon as possible to report the incident. You need to have a qualified person determine the value of the damages. It is likely that the carrier will send someone out to review the damages.
Wow, that sounds awful! Sometimes property damage claims as involved as this would benefit from the advice of an attorney who practices in personal injury (even if no injuries were involved), simply because they are more familiar with tort law and automobile coverage questions. I would try to find a qualified auto accident attorney in your area and see if you can discuss this claim with them. Good luck!
It's going to be difficult to avoid estimates and the insurance company is not going to let you set the price. Get a police report a d report it to all applicable carriers. If you're going through your carrier, let them discuss things with the vehicles carrier. Good luck.
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