Maybe it was beginners luck the first two taco trucks, Juanitas Tacos and La Frontera, I tried in Vallejo were terrific. Not so lucky with the next two.
Taqueria Jalisco is on Broadway north of Nebraska and across the street from the church. Its marked by a permanent sign Tacos Jalisco Taco Truck posted above the sidewalk and has indoor seating in an abandoned discotheque. It certainly smelled good, but the two items I ordered were disappointing. The bread for my torta al pastor was stale and not great quality to start with. The pork was more stew-like than grilled and the marinade was insipid. The tamale, oddly, was filled with similarly seasoned pork and topped with bottled hot sauce.
La Cabañita taco truck is on Sonoma Blvd. at Indiana in the gas station parking lot across the street from the adult video store. I had the daily special of two sopes with rice and beans for $4 ordered with carnitas. The carnitas were some of the worst Ive ever been served stale and almost rancid tasting, hard dried-out texture, and lacking in flavor. The sope shells were too thick and doughy. Surprisingly, the sides of rice and beans were terrific. The rice was well seasoned with chicken broth and tomato, and the refried beans were creamy and flavorful. The hot sauce was nothing special.
For now, best to stick with Juanitas and La Frontera (link below).