Yeah the BELAZ is broken. Sad do see a legendary mod like this break. And pretty much all other old heavg duty machinery mods are broken too, there weren't many to begin with.
Yeah it "works" for pretending you are farming and stuff, but nothing in that pack ever crashed realistically. Also there's the MAN TGS with the crane if that counts.
Well, there is the Gavril B-Series mod that I would consider to be quite heavy machinery since the last update. https://www.beamng.com/resources/b-series-off-road-semi.12702/