Abstract: The present invention is for a multi-combination vehicle including a prime mover having an engine and at least one powered trailer mechanically coupled to the prime mover. A control system measures the relative motion or force between the two, preferably by the use of a load cell and accordingly adjusts the operation of the engine on the power trailer so that the powered trailer and the prime mover are synchronized in their movement. This allows a multi-combination vehicle to carry a significant load, by providing sufficient motive power without the potential for damage to the transmission and differential system of the prime mover.