That was my feeling to but what research that has been done on the subject suggested that trailers were more visible than bike seats, that traffic gives you a wider birth and that any incidents involving trailers result in less serious injury to the children than those in seats.

I've ridden in London with child seats, trailers and trailer bikes and haven't really noticed any difference in how you are treated with each. You get marginally more consideration than you do on your own on a bike but you still get selfish idiots take massive and knowing risks with your safety at times