Sorry for not answering your question sooner, Chuckm! I combine about 400 acres of heavy winter wheat per year; - meaning that we tend to sow a heavier seed population than most neigboring farmers. I use the flexhead so there is an incredible amount of "trash" going through the machine. In addition, I combine 1600 acres of 135-160 bushel corn and about 1100 acres of 55-75 bushel soybeans.