Probably you already have an answer to this question in the time that's passed. There is indeed a Sales Landing Road in Benton County. I have never heard the origin of the name. Directions: from the Court Square in Camden, go east on East Lake Street which turns into Eva Road. In about 3 or 4 miles, you are passing a golf course on the left. Sales Landing Road turns right off Eva Rd. at a small store in the corner. It does go down to the Tennessee River/Kentucky Lake, so it's highly possible that your ancestor did have a business there.