During the Vietnam War era, Turner's business prospered; it had "virtual monopolies in Savannah, Macon, Columbus, and Charleston" and was the "largest outdoor advertising company in the Southeast", according to "It Ain't as Easy as It Looks". The book observed that Turner "discovered his father had sheltered a substantial amount of taxable income over the years by personally lending it back to the company" and "discovered that the billboard business could be a gold mine, a tax-depreciable revenue stream that threw off enormous amounts of cash with almost no capital investment".