Ideas for a table to extend the rear "deck"

I am looking for a better idea than I have been able to come up with to add a "table" to extend the edge of the rear deck when the hatch is open. I have about 8-inches there now, but some kind of a removable or fold up arrangement would be good. I would like to get around 15-18 inches of 'table" If you have worked out something (other than a free-standing table) I would certainly appreciate a photo or description. Thank you. (Its for my 8-ft Cubby)