I have almost exactly the same situation as you describe, I managed to do a frame-off in that space by creative movement of parts and pieces.
https://www.flickr.com/photos/advance-design_parts_co/25002469381/in/album-72157631867396207/
I just back the vehicles out for project work (in good weather).
https://www.flickr.com/photos/advance-design_parts_co/15589650912/in/album-72157631866985745/