With International covered, I started in on the main commercial cross-street: Fruitvale. Result: two more Oakland trucks down:
(driveway, south side of 1500 block of Fruitvale)
Truck proclaims itself "Estilo Jalisco". Huge menu including not only traditional taco truck fare but mariscos coctiels, fajitas, even rice plates.
The benchmark al pastor taco was barebones but delicious, with an unusual touch of chipotle chile. A chicken sope was less sucessful: the crema on top was tangy in a way that made me suspicious that it was going off. I was glad I hadn't ordered any seafood! Horchata was awful: thin and so cinnamony it tasted like dissolved red hots -- I tossed it in the trash and bought a champurrado from the tamale man!
Also at this spot: small but full service (including meat market and antijitos) Mexican market, a bakery (Los Mexicanos, 1522 Fruitvale) with a large selection of incredibly cheap Mexican-style pastries, and a cart offering Javier's tamales (I got a couple but I haven't tried them yet).
(northeast corner of Fruitvale and Foothill)
This truck has pupusas and "hamburguensas" on the menu, but was out of pupusas. Al pastor taco was generously topped with cilantro and chopped onion but still managed to be bland. This truck also isn't as clean and well-maintained as I would like, and the corner didn't feel as safe as the other truck locations.
I was out of cash so I didn't check out the tamale cart on the opposite corner. This cart also offered champurrado. There seems to be a connection between making tamales and atoles/champurrado -- some kind of corn meal mojo involved?