In my opinion the best way to get rid of 2 or 3 inch stumps is to not make them in the first place. Don't clear trail with a bush hog. Clear trail with your bucket and grapple. Wait until a good rain, 2 days after the rain run your bucket along and push over these small "trees". Work and pull them with your grapple and stack to get rid of them. The brush piles makes for good game habitat. Don't have to deal with stumps if you don't have any. Your tractor will easily push over small trees after a rain. If the little brush didn't get grubbed out with the bucket or grapple, then think about brush hogging after a while. The reason for waiting a couple of days after a good rain is for the top of the ground to firm up so your tires don't dig as much, but down where the roots live it is still soft. Reserve brush hogging for the grass and weeds and small brush that attempts to grow back into the trail. At least that is the way I do it here in Missouri.