It would have been a lot better for the truck, and had better leverage, to back up to the post, raise the bed, then tie the chain off on the center of the gate, then lower the bed.
Visualizing this one would be my pick. Can see a length of angle iron over top of gate to distribute load on sheet metal, and no real load on the hydraulics at all.
Sincerely,
Toolmaker51
...we'll learn more by wandering than searching...
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