The boxes are a very good idea I'm all for them! If they are only going to be controlled by SRRS then the competitors shouldn't have to buy the box. It's no different then renting a transponder or tracker in other series. The option to buy the harness and mounting brackets should definitely be available though. If you are required to buy the box it should come with the radio so it can be used during other events not requiring it but as added safety their crew can provide for the crowd and the competitor. Everyone understands that at the SRRS races SRRS would be in control!