What happens when the rear wheel is not perpendicular to the ground?

There are two situations when it is not vertical. Generally, off-road vehicles and trucks will adjust the inclination, while cars, performance vehicles and supercars will adjust the negative inclination. What's the difference? Off-road vehicles and trucks generally run at a low speed, but the roads they walk on are generally bumpy and rugged, as well as sharp bends with various drops. This requires positive inclination adjustment to adapt to long-distance shock absorption and vehicle flexibility. In addition, for cars with negative inclination adjustment, you will find that the greater the load of your car, the more obvious the figure-eight shape is. In order to have better support performance at high speed and on corners, reduce the roll! As we all know, when a vehicle is on a curve, it will roll, so when it is suspended in a curve with a negative inclination angle, it will be pulled back, and the tire will be close to vertical to the ground, so that it will not become a positive inclination angle and tilt to the inside. So the problem you found is actually normal! Reduce the load of vehicles at ordinary times.