Got mine much cheaper ($175) than the one on the bikesatwork website: http://www.bikesatwork.com/bike-trailers/
Doubt I would pay the full $400. They list a couple other places that sell trailers as well: http://www.bikesatwork.com/hauling-cargo-by-bike/bicycle-trailer-guide.html
I found three trailers right here in Austin on the first day I looked on craigslist.
I figure many emergency situations are going to be bug-in. Fuel may be hard to come by and I don't have the money/time right now to build something solar powered. This will probably let me do quite a bit more than the average guy and still maintain my position well outside of the city.
In the event of bug-out I figure I'll just throw it in/on my car with my bike and when I run out of fuel, transfer everything to my bike and the trailer and keep going. I'll be able to carry a LOT more with this thing.