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I know Jake and others are happy with their wider heavier grapples but I've still in five years never seen anyone with a bigger grapple post a photo or describe something they were able to do that our little bitty 48 inch grapples cannot do just as well....
I have a 72" Gator on my tractor (dual arms). I can see there would be times that a 48" with a single arm would be useful, but for most of what I do I would much rather have the 72". I sell firewood and maintain my farm. Here's some examples where I beleive a wider grapple is a better choice than a smaller one:
-skimming the ground to clean up debris, usually firewood splitting scraps. In this case I can clear a wider path and pick up more material in each bite.
-picking up split firewood and moving it from A to B...again I can get a bigger scoop with the wider grapple...two arms helps clamp down on the wood.
-Picking up blocks and moving them towards the splitter. I cut my logs into 16" blocks and move them to my splitter using the grapple. In this situation, the wider grapple and dual arms is very nice...I can get a big load and clamp it good, even if uneven.
-loading the grapple with small -medium boulders...I have a lot of land that I've been grading and leveling...We have very rocky soil and I could easily have to move a few hundred 8-15" boulders in an acre. The 72" with dual arms allows me to push these boulders around to to make a pile without hitting my wheels, get a bigger bite of the pile and clamp it more securely for transport.
That being said, the smaller grapple could be nice for a more "concentrated force" task, where the 72" couldn't get under something...but I have the backhoe and hydro thumb for those tasks. My backhoe has more breakout force anyway.
As island pointed out, the heavy duty 72" grapple is, well, heavier, so my net lift is not as great as it would be with a 300lbs grapple. There have been quite a few times that I can't lift a large boulder with the grapple...however I'm not sure if 300 lbs. would make a difference either way.
That's my .02
-Mark.