Sorry it took so long for my reply. Computer bailed out on me. I am an instructor in the T-6 Texan II. Built by Ratheyon. Spent many years as an IP in the venerable old T-37, but the Air Force replaced it with the T-6. Pretty good airframe, really great state of the art instrumentation, but not as tough as the -37. Little more difficult to fly in formation than the -37, but it makes up for it in the weather (instruments). The T-37 is one of the greatest spinning aircraft ever made in my opinion. T-6 dosen't even come close.
Need to get a tractor. Longhorns and occasioanlly plain stocker cows on the 60 acres. Was looking at the Mah. 45 or 5500 2wd. Not sure if I would get my $ worth out of 4wd in Central Texas. I have recently discovered, however, that I have some flowing springs that keep what used to be dry ground really sloppy. After your experience with the 4500, what do you think. Do in need the 4 wheel?