I live in a rural area and don't remember hearing of any accidents involving trailers. There have been plenty of others though.
Sadly, I did. Can't say it was the high point of my day.
With many, it would be a pointless, time wasting and needlessly costly incumberance. Now if you actually came up with some statistics showing that there's a genuine problem that needs correcting, I might see a justification. But only if a workable system could be introduced that would actually make a difference. So far, nothing you've said persuades me at all.