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Was going to say the same as @Calumonwheels, would not do trailer here in Berlin, people are on the phone all the time, drive like complete idiots and there always is a car parked in the way so visibility is shit.
But Switzerland I'd do it, only been to Bern recently, but just the fact that not every corner has parked cars on it makes everything way safer. I was amazed (again) that you can basically see everything thats going on on roads as there are way less parked cars.
Also my sister uses one there, and I don't think she's exactly fearless.
Trailers are OK for pulling stuff but I would NEVER put a child in one. The risk of some motorist driving straight over it is much too high. I pull full size carla cargo trailers for work and drivers have driven in to the back of them plenty of times. Not worth it no matter how many flappy flags and lights you put on it.