I believe the stock machine is rated at 350 lbs of cargo payload. That is probably because of the plastic bed. This bed puts most of the load into the roll bar not the rear of the machine. There fore the weight of the rack is negligible. The machine total rated load including occupants is 780 I believe. That means with a single driver that don't weight to much this rack will carry far more than 350 lbs safely. I own a kubota 4x4 with loader for the big hauling jobs anyway.