Had a few spare moments, made some updates.
Added kitchen cubbies/shelves. Dividers are adjustable.
Got a base plate for the porta potty toilet, made a matching 3/4" plywood base, mounted it to the floor.
The toilet clips in, and removes easily by pulling the latch at the front. It's not meant to be used inside the trailer (although it could be), so this is more for secure transport & storage.
Added a shelf above the toilet. Also added a new 12v outlet in the corner, powered through 8 gauge wiring from the existing electrical setup. Note the 3 tiny holes drilled through the shelf - the fridge is bolted down through these holes.
And here is the 30QT fridge. Runs very quiet, and draws 4.45amps at max power. Completely empty, it cooled from 30C to 10C in about 15 minutes.
The fridge is bolted down through the plywood shelf, using original holes/threads on the fridge's floor, but with longer bolts. I might remove the bolts and use an overtop strap in the future; will see.
I'll be adding a drawer between the fridge shelf and the toilet in the near future.
I also removed the propane lines running through the interior of the trailer, leaving only the one running to the water heater. I did a ton of research into propane appliances and realized that my low-pressure system would not run typical camping propane stoves (as I intended), and the best course of action was to remove it. I might add an inverter for a hot plate in the interior, but realistically, will probably just use a 1lb propane tank and my existing stove when/if cooking inside.