Mark IV (1990–1999) – At the start of the 1990s, a new Roadshow facility was required, with the ability to cater for further live performances and bigger crowds. The new facility consisted of a main vehicle with the core audio facilities and stage, plus a second vehicle that backed up onto the main vehicle, providing office and green room facilities for guests. Special PA lifts were installed to allow the speakers for the PA system to be easily lifted up to the roof. In 2003 it was purchased by Totally Sound Ltd. On the eve of the 45th anniversary of the very first roadshow, Tony Miles announced he had purchased both Mark IV units and would be restoring them to their former glory.