The Western Star 6900 XD (in-game: Whiplash 9004) is a truck available in 18 Wheels of Steel series manufactured by the American truck manufacturer Western Star.
The truck is featured in 18 Wheels of Steel: Across America, American Long Haul, Convoy, Extreme Trucker 2, Haulin' and Pedal to the Metal.
In 18 Wheels of Steel: Extreme Trucker 2, the truck can be used in the Montana and Tuktoyaktuk Winter Road maps.