Is commercial vehicle insurance cheaper than passenger vehicle insurance?

It might. You should check with your personal auto insurance first. For some business use they will extend the coverage. If they tell you that it will not be covered under your personal policy then...

I would not think so, but, your lender does require that you carry collision insurance on the car, which is the lender's collateral. It depends on what the note you signed says about this. Read it.

yes. see previos answer.

You should add immediately but if you have an existing policy, you do have 30 days to add the vehicle but under the same coverage you currently have. For example if you currently insure an old...

only if your insurance company has on line documents. I have USAA and they provide this service