When Duane Barth purchased The Rental Store in Jamestown, N.D., in 1996, he had no idea portable sanitation would one day account for 80 percent of his business. Back then video rentals were a hot-ticket item at his four locations around Jamestown. Now, the outdated movie rentals are only available at one location, while the seven old portable restrooms that came with the business have been replaced with about 300 new units.What dramatically changed the business was the Bakken oilfield boom. Though Barth’s main business is located about 300 miles from the heart of the shale oil drilling frenzy, the
