The answer to your question is very fact specific. A total interview regarding all the facts (truck speed, your speed, visability or obstruction of view) would be required to give worthwhile guidance. The bottom line is that you tender the matter to your insurance carrier and let them hash it out with the truck's insurance carrier.
Certainly any US business entity can have foreign employees or independent contractors, including a Delaware LLC>
US citizens must pay income on their worldwide income. Foreign citizens residing abroad are subject to potentially different rules depending on their place of current residence. Tax treaties with the US may come into play. Your CPA will show you how to document payments for salary, commisions or other payments.
While you raise some interesting and valid points, there remain good reasons to form a business entity, and to do so properly.
A properly formed and maintained business entity provides potential tax benefits not available in a dba scenario. Further, while a business entity, including corporations, LLCs, Limited Partnerships do not provide a substitute for insurance, insurance only covers negligent, non-intentional matters, and there are numerous other reasons why one might desire or require...
It is conventional to use an LLP for doctors, but more for tax reasons than asset protection. You will be sued, if at all, as both an individual and the corporation/LLP. Insurance and other forms of asset protection will be more effective than the business entity alone.
Respectfully, you might consider some posting of the underlying facts to see if an Avvo attorney might be interested. If a number of attorneys have turned this down, you need to ask why. No meaningful damages? Not supported by the current state of the law? Getting around the guardian ad litem requirement to be represented by an attorney will not be possible according to my understanding of the state of the law in California.
No, you should hire a lawyer and you should do what the lawyer says. Police have plenty of experience in dealing with amateurs who want to "take the fifth". Then you will be looking for an attorney while incarcerated.
Norarization would not be permitted if the attorney was a beneficiary. Many attorneys are also notaries for the convenience of their clients, and there is no conflict of interest in notarizing a signature on a document prepared by an attorney for the benefit of a client.