Steve...... The coachwork on that model (and all for the last ten years or so) has been built with an internal Roll Over Protective System (ROPS) to meet ADR 59. It would take a lot more than flipping one over with a forklift to damage the body. I saw a ATW bus similar to this that had rolled over at 80kph and there was virtually no frame damage..... Before you ask, it was driver error . He was data logged doing that speed through a section that everyone else goes through at 40kph so I do t know what he was thinking.
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Also note in the picture above that the bus frame is at a height that acts as a roll bar to protect the occupants of the FUSO cab.... That's also part of that particular ADR requirement.