And they'll stay there until they burn down

In germany we call them containers

Ugh we had those in preparatory school... They were called "mobile units" but never moved. Our class was in UM3. I could never focus because it was burning in the summer, freezing in winter, and the heaters were electrical and only warming space in a 1m radius. But one day I had crossed my legs and the sole of my shoes was against it and starting to feel sticky. & my fav game was to stick a pen in the heater until it melted so I could twist it in funny shapes.

We called them trailers. I spent 4th grade in one.