As a concept, the Crosstown bike trailer has it's merits. However, the design and the engineering requires a little evolution. I very much like the idea of a folding touring trailer that can live on the bike for shipment; whether it be by air, or sea, and then in just a matter of moments and without tools is ready for the cycle tour to commence.

www.youtube.com/watch?v=J992-8VJ_ac

Other considerations are the extra wheel:

http://www.youtube.com/watch?v=6ijnEr1kn98

an the Oxtail trailer:

http://www.youtube.com/watch?v=8ZeHWhJXS_Y