with that much road, would look at a TNT (top and tilt) for the 3 pt hitch. so you can easily adjust top link with a cylinder, and adjust one of the lower lift arms with a cylinder. to adjust angle and tilt, of a rear scrapper blade, box blade, or land plane / grader blade.
the TNT more so the ""tilt"" can be nice to help keep the "crown" of the road. to allow better water run off. the TNT "top" can be nice adjust forward to backward angle of rear blade, but more so box blade. to cut differently into the dirt.
rear blades, can get ugly, on dirt / gravel roads. and if not careful will begin "skipping" across the dirt / gravel. leaving mini speed bumps clear down the road. rear blades are good at pulling rock that is off on the side of the road back onto the road. they can be used to help create ditches
rear blade would be an "angle cylinder" to change angle of the blade beyond the TNT for 3pt hitch.
make sure you get something large enough, so when you angle the blade it covers both rear tires, if your tractor will handle it that is. some times having shorter width can mean easier pulling power, vs larger size blade.
box blades, are good at filling pot holes and leveling things out. and smoothing things out. scraficers (teeth) on box blades can be used to help break up hard packed dirt. and then go back with box blade or something else to smooth things out.
box blade, some folks have made the scraficers (teeth) into hyd version, so they can lower / raise the teeth with a lever on tractor vs manual lower / raising each tooth.
land plane / grader blade, kinda lifts rock and dirt up, and sifts things so rock comes to the top and sends the dirt down to the bottom. and good at smoothing things out.
land plane / grader blade. use of short chain and pipe and then shorter top link to allow better float of the land plane / grader blade.
each one of the 3 can come in pretty handy, and would prefer all 3 if i had the choice.
pending on what you get and the road, you might want to add extra weight to all 3, though tend to see box blade and land plane / road grader get weight added to them more times than not here on TBN. so the blades on them cut deeper into the harder dirt / gravel.
www. everythingattachments .com (Temporarily blocked due to reports of company closure) has video of all three i do believe along with some detail about each one, and can be a starter of looking up prices for cat 2 3pt hitch equipment.
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there can be different grades or classes some may list things under from economical (cheap) for personal use, and then commercial / industrial use.
though when ya get into cat 2 3pt hitch. i am not sure, if there really is an economical personal use. due to size and cost of tractors needed to pull category 2 3pt hitch equipment.