I've got a shed in my backyard where I store all my junk.

 

Since the Y-shaped rear is a single big piece it takes up an annoying bit of space even in the garage. Without a garage my only suggestion would be maybe under a bed, although it'll probably stick out a bit. I can't think of any other place where you could put it where it would be out of the way. Maybe see if a relative or friend will let you store it at their place if they have the room?

 

I'm about to put it under my house but wrap it in something first so stuff does not get in it