Here’s what to do if you can’t find Charlotte’s hottest tacos.A taco stand that fits into the back of a truck, El Volcancito (on this particular night, in Indian Trail, NC) prepares to open.Credit: Timothy DePeughWhen The New York Times recently named El Volcancito in Charlotte as one of the 41 best places in the country to eat Mexican food, I had one question: Where was it?I consider myself fairly plugged into Charlotte’s food scene. It is, aft…