Here's what I've done. Removed the middle and front passenger seats. Fully recline the drivers seat. Slide the sheet in horizontally on top of the spare tire and on top of the drivers seat. I could then close the hatch. I drove home sitting on top of the sheet with my head touching the ceiling. It was incredibly stupid, but it was just for a few blocks.
My biggest disappointment with this van is that it can not carry 4x8 sheets worth a damn. (I still kinda lust for 93 eurovan with a manual transmission).