How to lift a trailer w/o a barn :-)
Thank you for posting all those great pictures. I think it inspired us to just get going with it, although we did not have the luxury of exposed rafters to lift against.
Fortunately, our landlord had 6 ratcheting jacks that we used to lift the shell while we removed the wheels and slid the frame out. We were able to slide the frame out the front, despite the rear bumper interfering with the jacks, by lifting with a 2x4 while a third and fourth person removed and repositioned the jacks. Tough work, but if you throw enough people at it, anything is possible. Kind of like an old fashioned barn raising. (how did your barn get built anyway?)
Here are a couple pictures that are hopefully pretty self-explanitory...