I havent operated one mate so I dont know. All I do know is every SZ Ive had terraced badly. I would assume that if the deck is connected to the wheels, it "should" follow the contours with the wheels. Problem start when there is low pressure and weight which changes the tires dynamics. Then add how far the deck sticks out from the casters/wheels. Put it this way, if there were solid casters on all 4 corners of the deck, then you wouldnt get terracing. But Im only guessing on the Ferris as I havent even seen one operating.