Should I file a police complaint or sue?

In addition to the answer already give, definitely contact your own auto insurer, because your uninsured motorists coverage may be applicable.

While your question sounds simple, the answer is a bit more complicated. And not clear, because my answer at least is going to be, it depends. ...

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How do it get recouped for all my damages caused by a uhaul trailer coming loose and hitting my car on the highway?

The short answer is you need the identity of the driver in order to go after him/her (via lawsuit or making a claim to his/her insurance company). ...

Can one still file an accident claim after 2 months?

In addition to what has already been said, if you didn't get any release or other acknowledgment of payment from the other driver, get to your...