This item is very similar to an aircraft attitude indicator (bank angle and climb-decent angle). Both are needed and both can save your life. However, that being said, tractors are not airborne, and if you need something like this on a tractor, maybe you should not be doing what your are doing or thinking of doing? I agree with the conversation regarding center of gravity (CG). That too is very critical in aircraft loading, as it too could save your life. Aircraft normally use a CG loading graph/chart, which is fore/aft center-line calculation. After all the calculations, consideration is given to flight time and how reduced fuel will change the CG during the flight. If ever the CG falls outside the CG envelope, you are in a no fly situation. I am not sure how this would work on a tractor, but who knows. Maybe manufacturers should seriously look into this. While placarding a tractor with never exceed limits might work, but there is always someone who will try to defy gravity.