This is a tough one for Airstream owners to answer -- not sure how many of us have seen the interior of a stripped Streamline Imperial.
That said, if it were an Airstream, I wouldn't do it. Why?
1) The way you describe it, too much weight will be carried by the wheel well rivets. Shells rarely come off smoothly and it takes extra force to get them up. In Airstreams, this can come from drag from caulk and hidden rivets. You could buckle your shell at the point where the rivets attach.
2) My biggest concern is from raising a large trailer from the low, middle point. As you raise that section, the shell will flex, shortening the distance between the very front and very back. If this happens, there is a pinching, will cause the trailer to be very hard to lift.
Here's a great link
to a lot of shell-off renovations that will hopefully help you find the best method for you.