Turret trucks are a man-up lift truck similar to an order selector with the exception that rather than fixed forks the forks are mounted on an additional mast and carriage that operates as a turret, turning 90 degrees in either direction facilitating picking and stocking on either side of the aisle. The man-up design makes it easer to handle loads in very tall racking. Very- narrow-aisle trucks are generally recommended to be used in conjunction with a guidance system (wire, rails, optical) within the aisles to increase safety and reduce property damage. Also Turret Trucks require that the floor be perfectly flat and level to operate correctly. Also see < href="/en/inventory-managment" class="q">Lift Truck Pics , < href="/en/inventory-managment" class="q">Lift Truck Basics, and < href="/en/inventory-managment" class="q">The Aisle Width Decision for more info.