I finally found an example of how ending a sentence with a preposition in English is not only not wrong, but is sometimes the best way to avoid ambiguity:

Make sure your facility’s storage room is clearly organized, so that people will know how to fit in their boxes.

vs

Make sure your facility’s storage room is clearly organized, so that people will know how to fit their boxes in.

It only works because of the implied “…to the storage room” at the end of the second sentence, though, so maybe it’s not the pure example I’ve been looking for.