I have a 4' brushhog on my 1500D, actually used it yesterday and will again today once I get off this fourm... I would not go any larger than a 48" due to the stability issues already mentioned, there is a fair amount of weight toward the back of the unit with the wheel, bracing and rear side of the deck. A 5' would put that weight just that much more further out. If you are on a hill going at a slant and get the front of the hog dragging then lift it up, you will have that weight levering against you as it shifts to the side. Gives you that uneasy filling inside if your not expecting it. /forums/images/graemlins/wink.gif