[adeuel]

My gosh, you are so angry. Simmer down.

No one, including me, is saying the trailer driver is not at fault.
Obviously, to the letter of the law, his trailer crossed the lane and is responsible.

I truly hope you find the answers you are looking for regarding your future claim, because without the ability to recognize that although you weren't legally at fault, but weren't driving defensively in the given situation, you are bound to have plenty more claims in the future, that also will not be your fault.

I remember an old ad from Audi that the best accident is the one you avoid. (regardless of fault)