For about 5 years now I have been making due with my Yanmar Tractor, it’s about 20 HP and can do some things we need it to do. But largely it gets stuck easily has difficulty running a 4 foot Brush hog etc. so I am afraid we need to upgrade to a larger tractor. We were thinking between a 40 to 70 HP diesel. Largely it would be great if I could run my Brush Hog at riding lawnmower speeds, that would be a vast improvement. Also it would be nice if I could use the back blade to clean out drainage areas, and it would be awesome if it could nudge a round bale up onto a pallet. When we get hay I usually will roll it out of the truck and push it up the driveway onto a pallet which is under a shelter to keep it dry. what I am wondering is if 4 wheel drive would allow me to go with the lower end of the horsepower range? Or would we be better off going with 2 wheel drive at the upper end of the range? We are going to try to find a used one, but around here they bring almost as much as a new one. Any thoughts or advice would be appreciated.