No way in **** I would shred somebody else's pasture with my equipment, no matter what they paid me. You have old stumps, t-post, rocks, old barb wire, logs, scrap metal, big holes, you name it. Plus wear and tear on your tractor, average-out annual maintenance, etc. Now, if he wants me to shred it using HIS tractor, with a contract that I will not be liable for damage, I might consider, but even then highly unlikely. I've known a couple of people who thought it was a neat way to earn extra money instead of letting their tractors sit in the shed. They both changed their minds VERY quickly.