The 12" square ground support tower. A system manufactured with the purpose of providing a lifting medium for a variety of Thomas trusses ranging from 12" x 12" through to heavy duty truss. The towers will provide the necessary equipment to support a truss rig in venues where the flying points are either not strong enough,or in the right place. Each tower is capable of lifting 2 ton to a maximum height of 33 feet. The 2 ton weight must include the self weight of the truss rig and the motors. The truss rig is raised and lowered by means of electric chain hoists. The motor is rigged in the truss and works in double fall due to the chain being passed over the roller beam at the top of the tower. The motor is then connected onto the other side of the sleeve block. Below, we list a brief description of the parts which make up a 12" ground support tower. The base of the tower has 4 screw jack assemblies with 6" diameter foot pads which are adjustable to enable leveling of the tower. The base also incorporates 4 ball castors which allows the whole rig to be accurately positioned before the tower is raised. Once the tower system is ready to be raised, all the screw jacks must be adjusted evenly and must take the load off the ball castors.