There are two El Toyanese taco trucks on Harrison street: one at 14th, next to Best Buy, and one at 19th, near a school of some sort. I’ve only eaten at the latter, but both are owned by the same company so one can assume a shared deliciousness.
I usually get the veggie burrito; my friends stick to the tacos (carne asada, veggie, etc). Everyone leaves satisfied.
Here’s a photo from my last visit:
Notice how they did not skimp on spicy / pickled carrots!