Today's food section in the LA Times has a very good article by Barbara Hansen on tacos in LA, including one truck location for the 3rd Pl. and Indiana St. site.
Listed, with descriptions and locations are:
Carnitas Michoacan, El Tacazo, El Taco Movil al Estilo Jalisco, Hugo's Tacos, La Mano Tortilleria & Meat Market, Rincon Taurino, Sanchez Taurino, Sam's Tacos, Tacos Tumbras a Tomas, Ricos Tacos, Sky's Gourmet Tacos, Taqueria Dorado, Taqueria El Cihualteco, Tacos El Gavilan, Taco Taxi, Taqueria Vista Hermosa and Yuca's (cited here many times).
Not bad for a newspaper that takes a beating here on a regular basis. I would suggest you register for free for the online paper at www.latimes.com and file this story for future reference.