This article is from the Outdoor Activities for Young Children FAQ, by Gloria Logan glogan@atk.com with numerous contributions by others.
Well, as it happens, I've done this experiment, or something similar.
I've strapped a child-sized weight, namely my son, into the trailer,
and then ridden over potholes, on busy streets, on dirt, up and down
steep hills. What happens if the trailer stops suddenly (if it gets
caught in a pothole, say, or more commonly for me if the gate I'm
trying to go through is wide enough for the bike but not the trailer)
is that the bike stops suddenly. And I can report that either the
bike tips over, or the rider does some fast maneuvering to keep on her
feet. And the passenger, strapped snugly in the trailer with an
ANSI--approved helmet, says "What happened, Mommy? I don't like
that." My experience, and that of my several trailer-using friends,
is that trailers tend to be noticed much better than cyclists without
trailers. I don't recommend kid seats on bikes, but trailers are
great. We use ours every day. The only trouble is the price, but
hey, compared to a second car, it's pennies.
 
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