Interesting thread. I've got a mile gravel drive with a third of it quite steep, a third sloped and a third flat. I have used a standard box blade on it for years, with occasional touch-ups with a rear blade. I have found that the BB performs quite differently depending on how you angle it - rotation - not one side higher. It has been outstanding for recovery of gravel and, of course, filling in potholes. But I also use an implement not yet mentioned here - a ratchet rake on my FEL. The RR seems to eliminate wash-boarding easily and can also be used to reduce bumps and other imperfections. Since I carry the RR on my tractor almost all the time for brush removal, etc., I can pop it down as I travel the drive to stop issues before they get big. BTW the RR is also good at loosening gravel in dry times when I'm using the back blade. I put both RR and blade down and it seems to find all kinds of gravel. I'm super careful, but plowing snow off the drive is still the biggest cause of problems. As several folks have observed, maintaining a long gravel drive is almost a work of art as you learn new things about implements, try different gravels, and gently remove snow. It's a challenge to put off new gravel as long as possible.