Tacos Oaxaca in Lillington, North Carolina, can compete with the best taquerias in the South. Credit: Natalie HoyRight off a gravel driveway on Lillington’s busy main road, sits a brightly colored mobile home that’s hard to miss. What used to be a popular burger spot in this small North Carolina town has transformed into a go-to destination for real-deal Mexican street food called Tacos Oaxaca. It not only serves great food, but true Southern ho…