The trailer looks great! I do have two questions. First question: it appears to me that you are using a solid axle, Will that cause trailer to bounce on rough surfaces? Second question deals with the distance from rear of rail to the taillights. Have you any concern about a cager running into the back of your hauled bike because he/she would be watching the lights instead of the bike?
I don't mean this as critical just trying to gain knowledge about question 1, and about question 2, I don't trust people enough to NOT run into the rear.
I see you have already addressed question #1.