The four-axle variant of the HVY Mixer is a large cement-mixer truck from Grand Theft Auto V and GTA Online that is due to appear in Grand Theft Auto VI. It appeared in the September 2022 leaks driving through Port Gellhorn in red alongside sightings of the base variant, and its Biff-derived cab and hood closely resemble the Kenworth T800.
Vehicle data via GTA Wiki (Fandom), CC BY-SA 3.0.