Check to see if you are installing the rear brackets on the correct side of the frame. If they are installed on the opposite side they may appear to be straight out, in reality they should angle to the rear if installed on the wrong side. This is because the rear bracket is angled to the front in relation to the frame rail as well as the center line of the frame. The front and center bracket being angled to the rear in relation to the frame rail, making them perpendicular to the center line of the frame.
