I’ve actually heard a lot of success stories regarding chassis/frame/body straightening on trucks with trees (lots of YouTube videos but here’s a rare blog post [0]). The hilarity ensues when one attempts to straighten the chassis of a unibody vehicle in the same manner (true story, and no, it wasn’t me).
[0]: https://blacksprucehound.com/2018/01/16/redneck-vehicle-fram...