I would find it hard to believe the axle tubing is bent. The axle is offset to the side not the tire forward or backward. If the tubing was bent, mtl the tire would be offset in the well and not the whole axle shifted to one side.
Based on the accident, I would think the links to the axle and thier mounts would be bent and/or off. Since the track bar is much thicker than the control arms, I wouldn't think the track bar itself is the issue. From the impact, the 'jolt' on the body to the frame to the brakes holding the axle, I'm guessing the brackets would be bent. It would be obvious, I would think, if any of the arms were bent as they are stamped steel pieces pretty much straight. They also go into the brackets straight and are 90* to their mounting bolts.