I have a completely stock rzr 900xp. It has aftermarket metal doors, and 4 point belts. This machine has been well taken care of, only 2000 miles. To my knowledge it has never been to the dunes. I have really only used it while fixing fence and spraying pastures. Absolutely nothing wrong with this machine. Only reason for selling is to get a ranger instead. Would consider trades for a cabbed ranger or defender.