At this point my trailer is in stock form but I hope to work on addressing that here this spring!
Plans are modest, rip out the internal plywood, install an escape hatch/roof vent, possibly replace the side door with a travel trailer door, insulate everything, add slightley heavier plywood to walls, add e-track to allow bunks, shelves, and tiedowns to be used.
From there, I want to build a portable solar system - wagon with batteries, solar charger, and mounts for 1 or 2 solar panels. Wagon will have hardpoints that I can attach heavy security cable/locks and it will be portable so I can move the wagon to keep the solar panels pointed into the sun to recharge batteries yet keep the trailer parked in the shade

Finally, I plan to add a rack on the tongue of the trailer where I can mount a 30-lb LP cylinder and perhaps a 12v Battery. Internally, I will run a more accessable 12v wiring inside the trailer so I can hook up things like fans, radio, etc. I may also run 110v electric so I can buy a small Honda EU2000i and run more then simply 12v items.
Just needs to all be lightweight as mine is a single axle unit so I need to stay under 3000#. I did that to avoid annual inspections plus the 6x10 fit in my garage, the 6x12 I don't think would have fit!