Good thing everybody's okay and the two propane tanks in the back seat (seat-belted in) which I was heading out to refill didn't blow up.
Couldn't find non-emergency number quickly, called 911, they said just exchange contact info and insurance. Did that. Police did show up and took down info and mostly just stood around and watched as me and the other dude had it almost wrapped up by then. Other guy needed to be towed (to his friend's body-shop) but wasn't sure how he was going to pay (no credit card?) so I paid the $200 to the tow-truck driver just to get things moving. Hope that isn't an implicit admission of guilt. Tried to call State Farm to report it but no answer. I drove home, despite the left side doors not opening. Car seems fine.
But I got new propane tanks afterwards on the way home ... who wants to come celebrate a delayed 4th of July tomorrow night at my place? Burgers and hot dogs!