Urban architecture in the US doesn't really suit itself to this kind of racing. And good luck getting a city or town counsel to close a large public area or private land owner or corporation to allow this level of risk. Yeah, lawyer lawyer...
The counter weight is actually another camera, also recording. Twice the footage, twice the chance to have something decent to use. And it is heavy as.
www.youtube.com/watch?v=grq0rhtbtAw