The only thing Bert had never quite perfected was wiring. The top floor, containing the original ceiling, was bright as anything. The Amazon manufacturer had wanted a mobile home for less affluent Amazons to feel warm and inviting. The bottom of the trailer was lit by Little sized lamps and modified windows to let in sunlight, but there were always pockets of shadows here and there. It made the bottom floor cozy and rustic seeming during the day and kind of depressing at night.
The bathroom was downstairs, too. My father in law could only do so much with plumbing without attracting unwanted attention.
Conversely, the top floor was almost airport levels of brightness, with the lights meant to shine far further than they were permitted. But every electric cord or cable had to be snaked through a drilled in hole down to the bottom floor so that it could be connected through an extension or surge protector.