Attention taco fans: In Somerville, Tenoch Mexican Taqueria plans to launch a trailer on the Tufts University campus after Labor Day. The taqueria has branches in Medford and in the North End, as well as a Boston food truck. Owner Alvaro Sandoval also plans to open a new restaurant at 378 Highland Ave. in Davis Square, with an expanded menu; plans for that are still in the works. Meanwhile, La Victoria Taqueria will open in Arlington Center by the third week in September, says owner Alex Barrientos. His original La Victoria Taqueria is a huge hit in Beverly.