Commonly known as the Deuce-and-a-half, the M135 was a soft top 2 12 ton, 6x6 truck made by General Motors Corporation for the U.S. Army and Air Force. It came in a variety of configurations, including ambulance, dump truck, gasoline, water tanker and more.By far the most common variant was the cargo version which could carry a dozen soldiers or loads of supplies. A double-wheeled version designated M211, and a tractor trailer model M221 were also widely produced. All were powered by the six-cylinder GMC 270 gas engine. Most came equipped with an early automatic transmission, the 5- or 6-speed Hydramatic. Additional performance features include air assisted power brakes, a 24-volt electrical system and sealed, waterproof ignition. The suspension featured front axles with auto engage. The top speed for the M135 was 58 mph. The weight of the M135 truck is between 12,330 and 12,740 pounds depending on the additional features, which sometimes included a Power Take Off PTO driveshaft system