I did that one time with my 1710 and a 5 ft. I t was kind of strange driving over little trees that were taller than I was and just having it chew them up. That sounded like a nice load for that tractor.
If you listen to some guys you'd have a 4 foot cutter on that thing. Until you are stalling out in first gear you aren't out of power. A HST is only limited by cutter weight.