There are plenty of reasons why gravel is a popular choice for driveways. The Vevor Drag Harrow, available at Amazon, is a solution that should fit your ride-on mower (or it can easily be adapted), and provides a fast and efficient way to make your driveway level again. Vevor's Drag Harrow is 4 feet by 4 feet with 69 steel teeth, each 4 inches long. A variety of adapters are available if your mower doesn't already have one. The Vevor Drag Harrow is currently available for around $165.