If they are in the 8" and above category, rent a grinder. If they are smaller, make a triangle out of 3" schedule 40 pipe with sides 4' long. and with two 3/4"dia.X2" long ears on one of the points.
Place the triangle with ears up so that it is at an angle over the top of the stump. Use a 1/2" proof test log chain and an additional short piece bolted on to capture the "ears" to prevent slippage. Place two used auto tires over the chain going to the comealong about 3' apart to catch a loose chain if things come undone.Do not use the tractor until last!!!!! Hook to other stumps and use a geared comealong (rollerchain type) to pull the stumps. Do not use cable or rope!!! they stretch and build up whiplash strength energy to kill. For the last stump use the tractor as a fixed object, not running!!! if needed, block the rear tires to hold it in place. If tension is not producing results, try chopping roots, not adding tension. Stay out of the direct recoil of the chain or triangle. This is serious work and I caution you to be careful. Do not let observers get in the road, and do not use the tractor with the engine on. I make no implied safety statement because it is inhearently dangerous.
JimN
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