Just got an idea. What about a rear upper anti sway bar that is fully usable but if you need the extra room and don't want to lose 4 plus inches of your floor: it would have a large nut in the center with threads on both halves of the sway bar and all you would need to do is move the bolt and swing both halves to each side??
It would have the structural integrety and the usability of the car w/o cu ft loss. I am still surprised on just how much room is back there!

Yo Joe, your right

 

you mean a strut bar

-joe