Is your tractor a 2WD? I didn't see the D after 1802. That would determine how much plow you can pull. What kind of plows do you have to choose from? Or do you plan to buy a new one?
I use my tiller to cut fire breaks around my longleaf pines. You just have to stop every so often and pull all the roots out of the tines. But then pine roots are limber. If it is roots from big oaks, it would be different.