I will soon be buying a tractor that I want to mount a backhoe on to from time to time. I would like the middle size backhoe (goes to 8' depth). What is the lowest HP rated tractor I should buy to power that hoe. Have been looking at Yanmar 3110-36 HP (gray market-inexpensive) but hard to find. There seems to be many more of the 20 to 30 HP tractors available than anything over 30HP. Can I get away with a tractor in the mid 20's -HP rating???????