Agri-Supply in Gardner would have more teeth, if you're able to add them... You could just use two teeth, pull the extra one out. With the soil type you have down there, you might be able to use it with caution. Worst case it stops the tractor, pick it up a little and carry on. Does your tractor have 4 wheel drive? If it's 2 wheel drive, forget about it and keep looking.
UPDATE: Your tractor is only 1500 lbs... you'll most likely will just be spinning your wheels - do you have a FEL? that will help a little... Like I said maybe buy it and trade for a smaller one.