Shakedown isn't located in 007/BFE. Travelin' folk that have literally all kinds of goods to offer (and not just NO!NO!WORDS!) exist in every campground, some more in others.
But Shakedown Street is different. If you ain't buyin' what the locals are sellin' you go in search of Shakedown. But as I said before it finds you. You don't find it.
Wander the outskirts of Centeroo, travel throughout the campgrounds, visit the various PODs, make friends with your neighbors, but just enjoy the entire experience that is 'Roo. Don't worry about Shakedown, you'll have plenty of adventures anyway!