Yes, I have heard that the 1010 & 2010 power plants were so bulletproof as the horizontal 2 cylinders....but being less tolerant of abuse than the horizontal 2s with their decades of development still leaves room for a decent tractor. That's all I'm saying.
Yep, I agree that the 420/430 series would be a better comparison. I just don't happen to have one handy. Wish I did...
On the rearing thing with a single front, it's not just a matter of weight, it's a matter of sideways resistance too. Maybe some other guys who used a single front tire configuration will chime in. The row crops weren't nearly so sensitive to the problem as the single front wheel tractors.
It's more than just rearing from lack of weight. Even if the front doesn't noticibly rise up, it gets light and then you lose all the side resistance. That doesn't happen with the row crop configuration so much because of how they are built.
On the single tire fronts, when the front end rises just a little bit you may not notice it until you have more traction with one rear wheel or maybe you notice that the steering is being unresponsive so you tap a wheel brake.
Then all of a sudden there is no side resistance from the front tire and the unequal push from the rear tires can make the whole front end swing sideways fast enough to make your vision blur. That's why I said be careful. Be especially careful with the wheel brakes. I scared myself several times until switching to the wide front.
rScotty