I have seen the stair step hillside chaffer made in Cheny Washington at farm shows. looks like a good idea, but I have serious doubts about putting in a chaffer in that weighs as much as that thing does. I heard they were working on a lighter version. The shoe shaker system in a CIH combine is not one of its strong points anyway and is prone to failure even with the OEM chaffer. And a good reason for going to a lighter air foil unit. Asked local CIH combine tech about them and he had nothing favorable to say about them. JMHO, no facts.