I do this stuff everyday for a living and the first thing I can say is, TEAR THAT THING APART! There is NOTHING but NOTHING that can be done, nor is there anything that can be said about repairing it until you get the rear bumper cover off, and the floor mat and junk out, NOTHING.

Get that out and we can give better advice. You will probably need to replace the rear crossmember and simply straighten the floor, but a pull should be done. And yes it will need quite a bit, a come-a-long is not likely going to do it. But it could, just get the thing torn down so we can get a better look at it.

That goes for the front as well, it looks like your right rad baffle is toast as well.

Brian