I always had a penchant for using weird signage, placards, decals and similar.
I had a close friend when growing up, whose father was an engineer at the electric company here (and another friend whose father was an engineer for the gas company, too). I could get any advertising sticker/placard I'd want from either friend, though it got stale after awhile to tag stuff with them. I switched to other types of weird tags that my aunt would get me from Mobil, where she worked. Then used various stickers another friend's dad got me, from his work as an industrial underwriter. I was always putting oddball decals on my cars as a teen.
So, when I was finishing (ha,ha they're never finished) my trailer build, I bought or had made (custom printed, or engraved) some signage to decorate my solo camper (the wife said she'd never camp in it).

- signage on my trailer.JPG (150.51 KiB) Viewed 1852 times
At the top right is the sign I hang on my on-board generator, referring to a device in one of my favorite 50's SciFi movies,
This Island Earth (1955). The device is the Interocitor. Obscure reference isn't it?...my kind of weird signage.
Here's a link to more, similar electrical warning signs (but not referring to Reddy Kilowatt, whom/which I became bored with, after so many uses as a kid).
https://www.google.com/search?q=electrical+hazard+warning+signage&rlz=1C1CHBF_enUS879US879&source=lnms&tbm=isch&sa=X&ved=2ahUKEwiEs4uwg5H2AhWfkWoFHeJuDOMQ_AUoAXoECAEQAw&biw=1536&bih=994&dpr=0.67I used one to make my modified sign. And, I'm still adding more, as I add or modify my trailer more, to my tongue box, and to the overhead storage tube (for fishing rods).