Wheels Spinning, vehicle not moving

Hi,

i have a staticmesh body of a tank with no collision
In its blueprint, i added static meshes in wheelshape with collision using constraints.

If i use addforceatlocation to the root of the tank, the tank drives around, wheels are rolling on the ground:

So far so good. Next step should be rotating the wheels in the suspension to move the tank instead of applying force by vectors to the body.

For testing i just added fixed a relative rotation per tick amount to each wheel.
The wheels are the only component touching the grond btw.

So here is the problem: all wheels spinning in the correct direction, tank not moving forwards but slightly backwards ?
(In the video, i rotate the tank by appling forces to the body, only to show, that the opposite wheels are spinning in the corret direction too)

Any ideas how i can get the force vector generated by the friciton rooted to the tanks body ?