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Classic rear end damage (I used to work in a body shop that specialized in Volvo). Some of the energy from the collision is still stored in the frame of the car. If you can get the stuck doors open, what will happen is that the crease in the quarter panel will get worse, and the doors might not close again.
In short, this is not an amateur job, you absolutely need a frame bench (or good hydraulics).
If you do a hack job on it, it'll be ugly and it'll probably drive like garbage. Chaining the bumper (ex-Eastern Bloc method) to a tree is not a good idea, and will probably result in a lost bumper, but no repair. Sledgehammering will get you tired out but nothing else. You need tons--literally--of pulling power to undo what tons of pushing power did. There's just no way around it. You will see the frame rails if you pop open the rear storage area and pull the carpet. Most likely you'll also see some bending of one or both of them.3
You could probably take it to a frame shop and have them do the frame, then do the rest yourself. Given the proper frame repair, the car should be OK. Maybe not perfect, but definitely not unsafe. In my experience, people are way too dramatic about auto body repairs, thinking that cars have been compromised beyond repair, which is often not the case. Unit frame vehicles have the advantage of transferring loads throughout the unit frame instead of just across old style body-on-frame parts. Although the indicated repair is probably to replace certain body parts, those parts may be repairable depending on how well they come out.
Bottom line, with a collision like this, a hack job will look like and drive like the piece of junk that it will be.
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