Autoloading the tipper does not work reliably. Optically, larger rocks clip through the tipper side walls and the tipper bottom. Worse: at times the rock will simply be pushed through the tipper bottom and lies on the ground. Repeating the auto-load function will grip the ore through the tipper, lift it up and put it down again. This usually (but not always) succeeds in delivering the rock into the tipper.
This makes the upgrade nearly seless, exept for cases where the rock is just outside of reach, but shows up as green square, as the arm can then perform a "stretch" manoeuvre that the player cannot perform and will reach the rock.
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