So the rear wheels are on trailing arms, but the front and middle are leading arms, which increase the incidence angle by the angle of the arm in regards to gro

So the rear wheels are on trailing arms, but the front and middle are leading arms, which increase the incidence angle by the angle of the arm in regards to ground? So impacting a 45degree slope would have the force of say 55 degrees, as the arm is ten below level? The trailing arm would then impact that same slope at effectively 35 degrees. Just trying to understand their conclusions.