Rustyiron,
The landplane is a great idea but my driveway has lots of what I call nuggets. These are rocks that stick up out of the ground. They can be 6" diameter or 6 feet diameter. You don't know until you dig it up. When I use the back blade it just bounces off of them. Here's a pic of some of the nuggets that came out of the excavation for the house construction, trench works and the shop excavation. For scale the rock wall is about 6' high and about 80' long. There is another one to the right of this one and it has the really big nuggets in it.

DK,
The pipe idea would definitely stop the blade from digging in but I would still have the issue of keeping the blade at the right height. Too low and I loose steering and too high and I leave a bunch of snow. Maybe I need a 2 step approach. Snow plow in front, set high enough that it doesn't catch and then a rear blade dragging on the surface to pick up what the plow missed. The rear blade is what I have been using for the last 10 years.
The landplane is a great idea but my driveway has lots of what I call nuggets. These are rocks that stick up out of the ground. They can be 6" diameter or 6 feet diameter. You don't know until you dig it up. When I use the back blade it just bounces off of them. Here's a pic of some of the nuggets that came out of the excavation for the house construction, trench works and the shop excavation. For scale the rock wall is about 6' high and about 80' long. There is another one to the right of this one and it has the really big nuggets in it.

DK,
The pipe idea would definitely stop the blade from digging in but I would still have the issue of keeping the blade at the right height. Too low and I loose steering and too high and I leave a bunch of snow. Maybe I need a 2 step approach. Snow plow in front, set high enough that it doesn't catch and then a rear blade dragging on the surface to pick up what the plow missed. The rear blade is what I have been using for the last 10 years.