http://legalinsurrection.com/2016/09/analysis-is-it-lawful-self-defense-to-run-down-rioters-surrounding-your-vehicle/
Surrounding the vehicle wouldn't be enough, they would have to try some other overt acts such as trying to open you car door, smashing windows with bludgeons or thrown object etc.
Trail by 12 or carried by six.....?
I would have no problem running some or all over. If you live twice it's okay but you only live once.
Absolutely. I say buy a 1975 Cadillac and reinforce the front end and then just mow these animals down.