Which firm should I hire for an 18-wheeler crash injury in PA?

I'm writing this on behalf of a family member. An 18-wheeler ran a stop sign at a rural intersection in eastern PA and hit their SUV broadside. Airlift to the hospital. Traumatic brain injury, broken femur, internal bleeding requiring surgery. Still in recovery. We are looking for a top car accident law firm that has handled 18-wheeler crashes and catastrophic injuries from commercial vehicle accidents. We cannot afford to hire the wrong firm for something this serious. Any recommendations?