Ok thanks.
But actually I think the axle is also bent for both trucks. I have F4 conical fulls, and if I force a wheel to be totally horizontal on the floor, it will lift the opposite wheel by a few mms. This means that if I ride straight, I'm not rolling on the full contact surface, just on about 1/3 of the wheel. However, if I take a deep turn, because both trucks turn inward, it will put both wheels on their full contact surface. I guess it's a technique on big trucks to give more stability when carving? Or is it totally random?