This is my Revolution Cargo Trailer, a shameless copy of a Bob Yak,
being towed by a cheap Halfords Carrera Subway. I bought the trailer
yesterday, and used it for the first time today. As well as the two LEDs
on the bike, there are two more on the top rail of the trailer just in front
of the wheel. They're obscured by the ladder from this angle, but they
can be seen from behind. Sorry about the poor picture, I don't have a
real camera, just a mobile (cellphone).