</font><font color="blue" class="small">( could you "bite" the end of a felled tree and skid it along, or would it slip out???
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Having just finished on clearing 9 30-40ft alder trees (with up to an 18" diameter) out let me tell you this, the 4n1 does remarkably well but a grapple (and I mean a real grapple, not the bucket grapple) would be a good addition to the accessory line.
I haven't tried it, but I don't think you'll get too far with trying to pick up the tree from the end. The 4n1 has teeth on the sides, so to get a good bite you really need to be perpenicular to the trunk. But when you pick up the tree that way, you also need to be mindful of the center of balance. Trees can be pretty darn heavy. I did use the PT and 4n1 to lift a felled tree at least a couple of times just so I could more easily cut it into more manageable 6-8 ft lengths. But to pull felled trees out (from ditches, etc) I just used a heavy heavy duty ratchet strap that I wrapped around the trunk and then hooked to the PT's hitch and pulled it out that way. And that's the technique I would suggest to you.
As to debating whether or not to get a 4n1: get it. I have both the 4n1 and large bucket. I use both. The capacity of the large bucket is great for moving around all that firewood after limbing and bucking. The 4n1 is a champ at digging, moving piles of brush around, grading, etc. But I will admit it is a compromise vs getting specialized tools for each of these tasks. For instance, the grapple bucket with its fangs will be more adept at picking up a pile of branches and twigs BUT I really think a real grapple would be even better as the bucket gets in the way (whereas a real grapple is more like when you close your hand around something with both the fingers and thumb coming together).