Weight/traction will be the issue, not power. I'd put it on the 185 if I were you.
Yes, I agree the loboy would not have an issue. They make 4 1/2 for box blades specifically for a garden tractor, and a land plane has less dragging resistance than a box blade. And it's a better tool for what I need to do. Box blades are lighter, usually around 150lbs for garden tractor applications, but they carry a massive amount more dirt when in use. Land planes, are heavier, between 200-250lbs, depending on brand and accessories, but have less resistance while in use. Traction will be less of an issue with a land plane than a box blade, but lifting it off the ground will be more work for the tractor, especially with the weight hanging farther off the back, versus a box. I need to use the 1650 because I am grading the 4 miles of ski trails on my property, and they are about 6 foot wide for the most part, with turns the loboy can't make, but the 1650 can without slowing down. I'm guessing the lift capacity was never published, as it's not in any manual that I have, and can't find it any where online.
