Dart is totalled.. now what ?

Sorry about your car! That looked like a relatively hard shot. Plus, the weight of that Ram on your bumper isn't good. Like it has been said, get that frame checked out 1st. If it were my car, I would be breaking out all my receipts and gathering prices on what needs to be replaced. I would keep the car, unless there is extensive frame damage.
If you don't have the willingness or ability to work on it, get a couple estimates. You need some ammunition when you counter their shitty offer, which needless to say, I would not accept. Good luck and keep us posted!