Originally Posted by
johnin
That link worked - it looks like that trailer has a belly under it to increase capacity - can't really tell from the pic. The ones I'm thinking of are in about the same position but they're just flat panels, a little more tucked in in front so that they form a kind of "V" shape under the trailer.
Those what you describe are meant to protect Cyclists and Pedestrians from going under the trailer. They must've been invented in Europe. I've heard of them through Transportation Alternatives, of New York City.