Abstract: A jack is mounted on each longitudinal frame channel aft of the wheels of a trailer. A pivoted leg with a foot plate on one end is pivotally mounted on the frame for rotation in a fore and aft vertical plane. When not in use, the leg is held in horizontal attitude by a latch pin. In the event a trailer tire becomes flat and it is desired to elevate the wheel for replacement, the latch pin is retracted and the leg rotated to a rearward and downward position wherein the toe of the foot plate engages the ground. The trailer is then slowly backed a few inches, causing the leg to tilt into vertical attitude, at which juncture it is locked in place by the latch pin.Since the leg is longer than the radius of the wheel the wheel is elevated above ground level when the leg is vertical. Wheel replacement is thereby facilitated. The wheel is returned to ground level by reversing the foregoing steps.