I'm not super savvy when it comes to programing any mods, but I can imagine it wouldnt be too hard to find some type of giant monster model that you can make relativley heavy to use as a crusher? Anything like this being worked on at the moment?
I remember that there is a mod for a giant Godzilla, and it was actually made by a guy called Godzilla. It was not on the repository, as far as I remember it had a normal and giant version. Now it should be included in this mod but I'm not sure if it still works, hasn't been updated for years: https://www.beamng.com/threads/gpack-addition.59163/