There's a chance that you can remove the piece that supports the bar, under the trailer, and lower the lift arm out of the shell without having to lift the shell. It's held in with three or so lag bolts. I haven't looked under my trailer to see if this is possible. Don't strip out the holes, that piece supports a share of the shell weight. And you'll need some wood pieces or a jack to hold up that corner of the shell. Gee, that would make things easier, if it works.
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