Dumb Question regarding Insurance

The truck legal owner at the time of the accident is financially responsible.
If the vehicle was in possession of a repo company they will be added to the lawsuit also.
Which raises the question is the driver that was driving without insurance also responsible. I'm sure the lawyer will go after him too.
What about the company you are driving for stops paying the insurance and it gets cancelled without you knowing? That's a tough one.

 

Company drivers have a presumption of innocence in a scenario like you portrayed. That only applies if they have a company issued insurance card in the truck showing valid insurance. There is no way the driver would know if it's cancelled. He/she takes it on good faith that the company they drive for has & is doing their due diligence.
In the case of lease operators and owner ops buying insurance through the carrier things get a little murky. A lot rides on the lease contract wording.
Due to trial lawyers practices of listing everyone and their mother on a lawsuit the driver will most likely be listed just for good measure in hopes of getting a higher award.
Look up the Reptilian Strategy or Reptilian Brain Strategy used in litigation. With the success of this tactic you want to always have a lawyer.