The weight "at the pins" I assume is with no bucket or forks etc. The sheetrock is also laying on its side away from the pins and thus heavier... Maybe a small shelf under the pins and the rock vertical...it may have done it.
Thanks for the great thoughts and comments so far. To respond in no particular order... The HLA4248 pallet forks weigh 425lbs. The truck was up on the main driveway so my front wheels were elevated and the forks were effectively pointed downward to be level to the load. The act of backing down to level ground caused the load to be angled downward. Had I lowered the load further with that angle, I would have likely lost a few sheets. I did not think to consider resting the fork tips on the deck.
I had assumed that the quoted lift capacity included the bucket so I was just dealing with the weight difference between the bucket and forks. If not, then 1800+425 is approaching the max.
I still have more than 40 sheets in the garage so maybe I'll experiment with 1800lbs closer to the ground and report back.
I am very very happy with my Kioti but Here is a photo of my 30 sheets and firewood seasoning in the sun.
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The rack/pallet on the right (as we look at it), is that homemade - looks like a heavier gauge metal - could be a good use for all the old bed-frame rails I have been collecting!!