I just wanted to share my trailer. I found a $30 trailer off of craigslist and took off the canvas part. I had an old dog cage, so I used on of the fences off of it as a base or bottom for the trailer. It's light and strong. In this picture, it has a complete dog cage zip tied onto the base so I can carry my two dogs (or anything else I wish to carry). There really isn't much I can't carry with this setup, and I usually just keep the dog cage on the trailer because it keeps all my things on the trailer without having to use a bungee chord in most cases.

It's pretty strong. I sometimes use it to transport another bike to play bike polo or take it to the shop.

That trailer you posted seems like a good deal for the money, but I'd rather wait a few weeks (or months) and save $170 or so by making my own cargo trailer.