Just a quick update. We got hammered with snow these last few days. I have leveled the blower, meaning that the scraper blade is (mostly) parallel to the road surface. There is a good base layer of packed frozen snow. No more, or very little gravel is being sucked up. The small amount is likely due to the chains on the tractor kicking them up. Two nights ago, I was out blowing and sucked up a branch that apparently had fallen from the trees. The sheer pin for the auger, the secondary smaller pin, broke. The fan kept spinning, but the auger stopped with the branch sticking out of it. Back to the shop and 10 minutes later I was back in action.
So far, I love this thing! WAY better than using the FEL or box blade. I did look at putting a pipe or something on the front edge, and maybe that will happen when there isn't a frozen base down, but as of right now, I've cleared the driveway maybe a dozen times, and have gone though two pins. The cutting edge rides on the base layer, and the blower works great!
Thank you to all who have posted! I was hesitant to go this route, but glad I did.