Actually, the trailers are where you can get some of the best tacos and other quick Mexican food. The ones near white people bars at 2A usually aren't as good as the ones near Mexican population areas serving workers during the day.
I had the same reaction when I saw it. Had just been there a couple weeks before. Try La Michoacana, I think they do the best tamales in the city.
I've heard really good things about this place, but haven't been yet since I got thin and don't eat out much anymore. It's near my hood, I need to suck it up.