To get that slow it will need a fairly large hydraulic motor. Also a large motor makes more torque.
It's all in the math, motors are measured in displacement volume per revolution. You'll need to know the pump displacement at x RPM.
Then determine the speed the PTO needs to turn to get the desired ground speed. Match that to the speed the motor needs to turn, which can be adjusted with the chain sprocket ratio, engine speed, and a flow control valve if needed.
A lot to consider, but much better to work it out on paper than buying and installing the wrong components.
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