I have not been able to locate one or anything similar that could work. I don't even think there are hooks or whatever on the back area to attach the net vertically. I does not need to be super high. It would be even better if there were2 different attach points at 2 different heights in the back of the van. This way you can attach the net from the hatch lip up say 18-24 inches or move up 2 feet and attach the net from there up another 18-24 inch etc.
Maybe I am asking for 2 much. I don't understand why a net of some sort isn't available on a vehicle with such an extremly wide rear opening when nets are offered in cars and suv's all the time.