Abstract: A rigidified suspension is provided for a load-carrying vehicle, such as a trailer for a dual use, belly-dumping and end-dumping trailer, of the type having a frame with left and right side beams connected together and to which frame wheels are mounted through a suspension. The rigidified suspension includes left and right suspension rails, which are provided having a forward end and a rearward end and are horizontally disposed inward from and below the left and right side beams of the frame. A rear plate is fastened to said left and right side beams of the frame and extends downward therefrom adjacent to the rearward end of the left and right suspension rails. A connector brace is rigidly fastened to the rear ends of the left and right rails and to the rear plate and thereby between each other and the frame. A forward suspension brace is provided, rigidly fastening the forward ends of the left and right suspension rails to the frame and to each other.