room any suitable type of brake or restraint may be provided to lock the base against movement when appropriate base 11 includes a central platform 13 which supports vertical guides 14 it also supports a jack 15 which may for example be a screw type or even a hydraulic piston cylinder type a screw type will be preferred it is readily powered by a bi directional motor 16 that receives power from a source of electricity such as a battery 17 to minimize the bulk of the transport the jack is mounted to the base by a u shaped mounting bracket 18 that places the base of the jack as close to the floor as possible a bi directional and off on switch 19 determines the direction of operation of the jack by determining which direction the motor is to turn it also includes a u201c stop u201d position the jack will preferably be self locking so that a weight on it will not cause movement of the jack only operation of the motor will cause the jack to move if the jack is a screw type a screw with a locking angle will be used otherwise a brake will be provided a cap 20 includes a support 21 with.