Taller masts can be difficult to mount onto a vehicle due to the longer retracted lengths involved, so Clark Masts has designed a system to overcome this, allowing masts up to 30m extended height to be fitted to a wide range of vehicles. the roof trolley system carries the mast in a horizontal position in a frame on the vehicle roof, to deploy the mast the mast is rolled back and tilted to a vertical position and locked into place. An air hose is then attached and the mast is ready for extension.