Re: why 4x4 vehicles have nose down "no exception" ??
flipping over is more complicated than looking at your car as a simplified point object.
flipping over has something to do with torque because flipping over is a rotating motion.
going down hill and you have short wheelbase and very light in the back, you are going to start rotating forward if you brake hard enough if torque is strong enough to lift the back end.
same with uphill, if your front is light and you have too much throttle you flipping backwards.
long wheelbase is better than short wheelbase, lower car is better than higher car.
Other cars will get you somewhere, but a Land Cruiser will always get you home.
2013 Toyota FJ Cruiser
2017 Ford Mustang GT/CS
2015 Ducati Monster 1200