There's a few spots I've noticed it happen, notably that one LC road that goes up past the hospital/stadium with the P2B/FBI bump spots everyone has landed; go fast as shit and hit the wall and a fair few times youll go through. As for making it happen on purpose I doubt theres a way to make it happen more often that works consistently, maybe use foggy weather as that'll reduce draw distance and thus stop buildings loading as quickly, or set Teleport 1 to your runup and Teleport 2 to another island then TP to the other island so the first island deloads then quickly TP back to the original island and try the stunt while the map is loading. But ye it's mostly just gonna be luck and it wont happen often so gl.