Alvin and Wanda Schulze opened Schulze’s Bar-B-Que in Rosenberg, southwest of Houston, in 1990. Their son, Clifford, and daughter, Teresa Schulze-Mielsch, helped run it for decades before Alvin died in 2021. Around that time, Clifford and his wife, Sherry, had been looking for the right property for a second location. A plot of land in Fulshear didn’t work out, so they looked farther west, to New Braunfels, where they reached another dead end. “Everything we tried, we were just hitting a wall, and I thought, this just isn’t meant to be,” Sherry said. Then their realtor asked them what they thought about Seguin.A big red metal building that once housed Smoking Charlie’s Barbecue had sat vacant for years on the north side of Seguin, east…