I was moving logs on a set of forks a couple weeks ago with my 4145 (shuttle). I picked up a piece of oak that was a little better than 24" diameter and 16' long (it was longer originally but I had to cut it in half because it was too heavy to lift). It squatted the front tires right down (R1's, 18psi). I have loaded rears and had the backhoe on and I'll bet the rears were barely touching the ground. I didn't have to lift it more than 3 feet to set it on the pile, but it had no problem doing that. According to one of the log weight calculators I found (below), it was more than the 2700# limit, but I was going slowly and it was the last chunk I had to move.
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