You can't miss taco trucks. The huge delivery step-vans with flip-up side openings and well-equipped kitchens are located in parking lots and corners throughout the Bay Area. But now the familiar look of the taco truck is changing: make way for the taco trailer. Tacos El Sol is a carnival-style food stand that serves bountiful tacos, burritos, and tortas, and exemplifies this new trend. Pulled by a late-model pickup truck, the stand is a white chrome and glass enclosure with wonderful aromas wafting across the parking lot of Los Mexicanos Market. A bright mural of the cathedral at Autlan, Jalisco, faces the street and provides a splash of color to the busy Oakland street. Open from 7:00 a.m. to 2:00-3:00 a.m. on weekends and until midnight on weekdays.