What evidence is used to prove fault in truck accident cases?

What evidence is used to prove fault in truck accident cases? In truck accidents there are many facts that could use as evidence such as: who loaded the truck?, who checked the tires?, and more details that Jesus Novo explains in this video.

Transcription of the injury lawyer's response: In a truck accident the evidence that we will use to determine who is a fort, firstable truck accident are different than car accident and that many things going to play. For example who looter the low that the truck was transporting also who check the tires, how long has the driver been driving, all this things are considered in a truck accident.