The HVY Biff is a large multipurpose truck from Grand Theft Auto IV, V, and Online that is due to appear in Grand Theft Auto VI. Both the standard truck, seen stopped in red at a Vice City intersection, and its Mixer variant showed up in the September 2022 leaks, and its cab, hood, and headlights appear to be inspired by the Kenworth T300.
Vehicle data via GTA Wiki (Fandom), CC BY-SA 3.0.