Yikes.
Well, '02 Dakota's aren't exactly rare. My first instinct would be to check the inventory at the local wrecking yards and head out with a battery powered impact wrench and a sawzall and bring back a rear frame section that starts 6" ahead of that crossmember. That way you can just replace the whole crossmember, and have spare rail sections in case things look ugly when you start cleaning up the rear parts of those rails. Because that one looks pretty ugly starting at the spring mount. Just my thoughts, I'm not looking at it in person.
