First off - regarding the Land Pride - land plane grading scraper ( LPGS ). It makes VERY LITTLE difference if the unit is as wide as your rear tires or not. The LPGS is NOT used to cultivate your land and as the rear tires will pack down what the unit has skerfed up - so much the better.
I have a large, heavy Land Pride ( LPGS ). 84" wide and 830 pounds and with scarifiers.
As a road maintenance implement - the LPGS is not designed to create a crown on a gravel road. And - true to its word, it does not. It will lift the top inch or so of a gravel driveway and lay it back down. Adjusted properly - the driveway will be smooth as a babies bum.
Crown is created with a blade implement that can move material from the side to the center of a gravel road. To this end - I use my 1000 pound Rhino rear blade.
That "thing" in the top picture MIGHT be heavy enough to smooth sand on a beach. Properly adjusted the Land Pride will do the job you have. Particularly since you say the driveway is fairly hard.
Even on the hardest part of my mile long gravel driveway - I only set the LPGS to cut the top inch or so. If I have a serious pot hole - drop the scariffiers and fix the pot hole.
My Kubota
M6040 has more than sufficient power to pull the scariffiers through the hardest soil. And - believe me - my driveway "sets up" just like concrete. It's a mix of gravel, sand, silt and volcanic ash.
