No picture but I will try to describe. Saw this on a ride one day. Guy took a trailer like the ones landscapers use, made out of mesh over the frame. They built out of 2x4s a frame down each side that the wheels would slide down into. The bikes, about 10 mt. bikes, were put in opposite each other. Meaning one faces east, next one west and so on.

The best way I can describe is that the bikes ride facing the middle of the road and the berm. It was a slick setup to carry lots of bikes and looked like it did not cost a ton. Good luck.