I have a Dirty Old Monkey T2 trailer as a spare that I imported. Very light (3.6 kg without the bag) and modular so will fit in a largish duffel. Retail is 500 and air freight from Taiwan was an unfathomable amount, but I could use cash rather than a spare trailer and will take 550 shipped within the US including spare tire, tube, misc parts, and both a 75 liter drybag and a lighter nylon kit bag (I bought two thinking the design might have some flaws and I would need spares, but nothing has broken yet and the trailer performs better than advertised). There are few to no English reviews, but the trailer is one of the best designed I've used.
http://www.freeparable.com/t2
