I currently operate two tractors on a 600 acre tree farm: A 1964 JD 2010 RU that my dad bought new and a JD 6403 98 HP tractor that I bought new 7 years ago. It has approx 700 hours. I do most of my light mowing with the 2010. This consists of 10 acres of lawn with a 6 ft grooming mower and 10+...