Sean Duffy 's going back to his TV roots, but this time, he's bringing the whole family and a patriotic mission along for the ride ... TMZ has learned. Sources with direct knowledge tell TMZ ... Bunim/Murray Productions -- the same company that produced Sean on MTV's "The Real World: Boston" back in 1997 -- is currently in production on a YouTube series centered around the Transportation Secretary and is being hosted and paid for by the " Great American Road Trip ," an independent nonprofit