Abstract: Disclosed herein is a portable baseball backstop mounted on a vehicle trailer and includes a 3 section fencing unit, with optional fourth section placed above the center portion of the 3 section unit. The backstop is permanently attached or mounted to the trailer and easily placed at the desired location for set up and use by players. The backstop is lifted with the help of a winch/pulley system out of the trailer and set up on the ground with the trailer serving as support system for the backstop. Each of the sections of the 3 section unit are secured in the ground for safe use of the backstop and to eliminate any falling of the backstop during play. The backstop is also secured sufficiently to withstand baseball speeds of about 90+ miles per hour. In particular disclosed herein is a first and second planar fence sections. The first planar fence section is attached to a movable shaft. The movable shaft is pivotally connected to a first end of a trailer.