I have $26,000 in the tractor and bailer. The 6000 will run the 4X4 bails with ease, as well as 4X5 and 4X6 bails. I usually bail around 1800 RPM, which is well under what the 6000 is capable of. It has more than enough horsepower to do the 4X4 bails. The 504 Rebel bailer will work on a 40 Horsepower tractor though it might be a grunt for one if the terrain is steep. On flat land I think I could pull it with my Ford Golden Jubilee and it is only rated at 34 Horsepower but you need remote hydraulics to operate the bailer. Where I live is in the foothills of the Ozark Mountains. I do some bailing for neighbors and due to the terrain I felt I needed the four-wheel drive. My philosophy on horsepower has all ways been, it is better to have it and not need it than to need it and not have it. The Mahindra and the Vermeer Rebel Bailer have impressed me, so much so that I sold my square bailer. If I never stack a square bail in a barn again in my life, it will be to soon. I would recommend this combination to anyone with similar needs. All of my neighbors have been very impressed with the ease of operation and the quality of the finished bails with the Mahindra/Vermeer combination as compared to others they have experienced in the past. If you can swing the cost, I know you won’t be disappointed. This setup works so easy that my wife will do some of the bailing and you know how hard it is to find good help. /forums/images/graemlins/grin.gif