Abstract: Provided is a trailer platform having an adjustable ball position. The platform has a first end portion sized to removably mount within a trailer hitch receiver and a second end portion opposite the first end portion. A movable ball mount having a ball hole sized to mount a trailer ball is on the movable ball mount and the movable ball mount is movably mounted on the second end portion of the platform so that the movable ball mount can be moved between a retracted position and an extended position on the platform to adjust a distance between the first end of the platform the ball hole, with the extended position providing a greater distance between the ball hole and the first end portion than the distance between the ball hole and the first end portion in the retracted position. Also provided is a method of using the movable ball mount to provide slack to disconnect a trailer coupler from the trailer ball.