At least you have the camera set up. I use an app on my phone called DailyRoads Voyager that records the last 5 minutes continuously. If I had had that going when that douche showered my car with rocks then he would not have gotten away with it. You can never go wrong recording your drives. Unless the cause is obvious a lot of times the cops will just spread the blame on both drivers and that could end up costing you the money you will need for paying next years tax increases.
EDIT: unless you can get a whole lane and a mile between, it's best to keep idiots in front of you where it is easy to keep an eye on them. You don't want to end up constantly looking in the mirror, then you become the distracted driver. I have actually seen worse driving from a guy in a 7 series texting while tailgating. Boston. Sucks.