What is a truck driver entitled to if he gets into an accident that isn't his fault?

My stepbrother was a trucker. He was driving late at night when a drunk driver hit him and was killed. The drunk driver did not have the headlights on on his pickup truck. The semi truck's warning system failed to alert my stepbrother that there was a vehicle in dangerous proximity. Nonetheless, my stepbrother lost his job and had to go to court. He lost the ability to own a car for several years as well as being blacklisted from trucking the rest of his life. I carry his car on my insurance and it's in my name just so he can get to work and back and have some kind of life. He was royally screwed by the trucking company. They were never held liable for the fact that their warning system failed to work.