Get a pipe cutting edge from Rob Piro at Michigan Iron Equipment (do a search on the forum). It's a iron pip welded to a cutting edge that bolts on to your plow. It will never wear out and will not pick up gravel. 72" is not too big for a bx if you ballast the front and make several swipes. I used a 72inch RB (pushing and pulling) and it works fine in Northwestern CT with 12 inch storms.