Thanks for your info, LD1. I'm glad to see that there are others who REALLY want to get the job done and not just fool around. I started out with a Land Pride RB 2584 rear blade - a hold over from my first tractor. It became immediately obvious that this rear blade was - more or less - a joke. My bigger tractor and the same rear blade just didn't improve the operations. As I remember this RB weighed around 535#. It did make interesting "sparkles" as it bounced along behind my new Kubota
M6040.
Then I bit the bullet - cried a little - bought my Rhino 950/8 foot rear blade. It weighs 1050# and can totally disrupt my mile long gravel driveway - if I'm not careful.
I will continue my search.