Ours was only a mile long and only had one short steep place near the house.
The best purchase I ever made was an eight foot road boss grader. (a clone thereof anyway) It takes about a 65 HP tractor to handle the weight on the 3 point lift. It will dress up a gravel or dirt track road almost as well as a small motor grader.
We are fortunate that we can dig buried river gravel off our property to use for repair and fill of soft spots. We just have to push the 6 in to 10 in river rocks off the side when dressing the surface.
