Last year I worked the roads in our development. Just like yours, they are packed crusher run and had developed potholes, ruts and washboard. The year before,(before I had the tractor) we just had new crusher run truck-spread and it looked great - but those potholes, ruts and washboard came right back within 3 months. So last year I went over the whole road with my box blade scarifiers down and scratched it up down to the depth of the lowest pothole. Then I put on my rake and raked it smooth. We didn't need to add any new gravel and it still looks fine this year.
Bottom line is that you'll need at least the box blade/scarifiers. You might get by leaving it at that but it will look a lot better if you also have the rake to go over it.