by incorporation of the locking feature commonly found on certain commercially available locking floor casters d locking floor casters are integrated with the jack assemblies as described above this feature allows the user to set the caster brakes when at the desired work location upon completing the task the user releases the caster brake to facilitate rolling the entire work platform to another desired location the body of the stabilizing jack a is welded or similarly securely joined to a length of steel box tube or similar square or rectangular structural material to provide a jack mounting tube which is depicted as item e each jack mounting tube e is perforated on its vertical axis through both faces of the square or rectangular tubing these perforations depicted as item f are located at one or more locations along the length of the jack mounting tube in drawing one the perforations f are depicted at three locations on each jack mounting tube e please reference drawing two which depicts a carriage as item g the carriage frame is fabricated from steel box tube or similar hollow rectangular or square tubing in such a manner that openings or receivers as depicted as items j and k are located at each corner of the carriage g item j receivers are located on the major axis of the carriage while item k receivers are located on the minor axis of the carriage a running fit is formed between the internal opening of each receiver j and k and the outside faces of each jack mounting tube item e thus allowing the engagement of a jack mounting tube e into any desired receiver j or k feature 2 readily changes or adjusts the position of each.