I'm not sure if that particular cart has been mentioned before, but the topic of a bug out cart comes up from time to time. Here's one thread on the topic.

Great for hauling loads that are too much to carry on your back, or to carry the same load farther, but I guess the practicality depends a lot on the situation that you'll be using it in. Both a dense, urban situation full of unprepared folks could make a juicy target, and on the other extreme, rough terrain could be too hard to navigate.

What kind of situation were you thinking of specifically? Pulling it along rural roads?