Gears work wonders so power is what really matters
You need a certain amount of torque at the wheels to pull a plow, if you don’t have enough then it just doesn’t move, but if you want to pull a plow quickly you need power. Most farming implements create drag that works similar to just normal friction where a small plow might pull back at 500 Newtons regardless of speed.
Power is Torque*RPMs with a scale factor depending on your units, and torque at the wheels to pulling force is a flat scale factor depending on the size of the wheels, the end result is that that speed you can pull a given plow through the dirt scales with the power of the engine regardless of the torque value (assuming your gears can get you enough torque at the wheels). Pulling that little plow along at 2 m/s requires 1 kW of power but 4 m/s requires 2 kW while both speeds only require that the torque at the wheels be enough to provide a 500 Newton forward force
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