Is that a steam powered truck? Looks like the steam cylinder is under the bed in front of the differential
1927 - A Super Sentinel rigid six wheeler truck loaded with the Sunbeam 1000 HP. On March 29, 1927, British automobile pioneer Henry Segrave (1896–1930) drove the car to a new land speed record on Daytona Beach, achieving 327.97 km/h (203. 79 mph)—the first car to reach a speed over 320 KM/h (200 mph). Another Ride On-Board 1927 Sentinel Super Steam Waggon "Vectis Knight" (youtube.com) This is another ride on board 1927 Sentinel Super steam waggon "Vectis Knight", this time on two road runs to the pub from Haddenham Steam Rally 2011. And, as a special bonus, there are a few minutes video footage at the end shot by the engine owner himself while sitting in the back (with his slight drunkeness and lack of technological know-how!)