gutting my trailer.......

You've come to the right place. It would have obviously been better to keep the cabinets in place for stability since they provide essential strength. If you build some internal bracing with top and bottom 2x4 and a rigid "x" structure between them, it should hold it's shape as you remove the skins. This is very important because behind all that rot you see from the inside is rot you can only see from the outside.

That roof framing looks strange to me. Did you repair it exactly as it was built? Once you get the skins off, you'll probably want to remove the new wood since it's important to sandwich the interior plywood sheets between the framing and overlapping the walls for strength.

Honestly, with the amount of disassembly you've done, the easiest way to proceed is remove the skins, remove the walls and repair the floor and walls separately, then rebuild it. My blog below has an example of this but it's kind of like your build...oops, what have I done!. mobiltec and others have done more purposeful full disassembly builds that are better guides.

Agree with above. I hope you took a bunch of pics before you started gutting it. It looks like a cool project. Disassemble to the frame and do a lot of research on rebuilding. Take lots of measurements of what you have left. It will be crucial to stay in those measurements to make the skin work out at the end. Looks like you figured out how to post pics so the hard part is over.

We like questions!

Well it's a little late now I think.