In our studies we defined a complete loss of stability as when one rear tire became unloaded - at this point the tractor is balanced about its "tipping axis". The width of the front axle never comes into play. The key is the height at which the tractor pivots at the front end. With a narrow front this point is at ground level while on a wide front it is elevated by up to several feet. This raised tipping point means that the WFE tractor has to lean over farther for the center of gravity to cross over the tipping axis. A similar situation occurs when turning a corner at higher speeds. The centrifugal force acting horizontally at the center of gravity is closer to the tipping axis which means it is applying less moment to unload the inside tire. The WFE vs NFE stability differences are more pronounced the farther forward and upward the center of gravity is located, such as with a loader. As you say, the best defense is to lower the tractor's CG and also have the rear tread width set as wide as possible.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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