In an effort to extend its brand through a wide variety of innovative formats, Winnebago Industries Inc. is expecting to draw as many as 20,000 country music fans this Memorial Day weekend to its 2nd annual "Tree Town Country Music Festival" for performances by C&W luminaries Deirks Bentley, Rascal Flatts and Blake Shelton. The festival at Winnebago's Forest City, Iowa, rally grounds is all part of an ongoing metamorphosis that publicly held Winnebago has been implementing in its drive to evolve from what Winnebago Chairman, CEO and President Randy Potts describes as "Grandpa's Winnebago" to a more modern corporate entity.