Leo’s Tacos TruckWhen I got to Leo’s Tacos Truck, I planned to play it cool, but the spinning trompo drew me in like a beacon. This truck felt like a postcard that smudged itself with chile and joy. Tacos El GrullenseRedwood City smelled like victory the moment I reached Tacos El Grullense at 1243 Middlefield Rd. Tacos El Rey (Berkeley Truck)I found Tacos El Rey tucked at Ashby Ave and 7th St in Berkeley, where the air smelled like ambition and grilled onions. Maria’s Taco TruckSacramento welcomed me with Maria’s Taco Truck at 6220 Fruitridge Rd, a sunny strip where the grill scent draws a crowd.