Not a lawyer, but I was a State of Wisconsin licensed private investigator for almost five years.
The lawyers I worked for always told me the last guy to be hit in the rear "technically" could go after everyone behind them involved in the accident that caused him to be hit. Talk to a lawyer in your juristiction and don't try your case in public forums as the advice may not hold true where your accident happened.
From your statements, I do not hold out much hope for your case.
Bountyhunter