I had long heard about the mystical "best taco truck in Seattle" taco truck in the Home Depot parking lot in the far north (hinterland, from my native perspective) of Seattle. The truck is El Camión, and I am pleased to report that it was indeed fantastic.
If a taco truck can be judged by its salsas (and it can, IMHO), El Camión is in a very special league. In addition to the usual roasty red, and tomatillo green, and creamy thin avocado sauce, El Camión has a handfull of other hard to describe but fantastically delicious homemade salsas, all available on a "take as much as you desire" salsa bar (YES!).
I was hungry, and never fully knowing how large a taco truck taco is going to be, ordered four vegetarian tacos. I was shocked at the heft of the food I received. The hearty (vegan?) tacos were covered in stewed black beans, grilled veggies, and pico de gayo. I added a generous amount of salsa and pickled onions and found that two tacos made a filling meal.