That makes no sense. You can get torque with lower gearing, therefore, if tractors only needed torque, then even the largest tractors could get by with a tiny e

That makes no sense. You can get torque with lower gearing, therefore, if tractors only needed torque, then even the largest tractors could get by with a tiny engine given enough gearing. The problem is, farmers need tractors to move faster than .1 MPH, so that is why they have large engines that generate serious HP.