Maybe you had one as a kid, or knew someone who did. It's the iconic little red wagon with the Radio Flyer logo.Radio Flyer is developing a prototype of a wagon with digital controls and an MP3 player dock.Radio Flyer is developing a prototype of a wagon with digital controls and an MP3 player dock.If so, you might not recognize the newest product dreamed up by the brain trust at Radio Flyer's Chicago, Illinois, headquarters. This wagon, called the Cloud 9, is equipped with enough high-tech bells and whistles to make the family minivan jealous.