Abstract: A tiltable rear bed portion of a flat bed vehicle including a pair of slotted restraining arms disposed under and along a pair of parallel, spaced bed supporting frames. The arms are pivotally attached on their rear ends to vertical support arms suspended from the frame members on the rear bed portion and are slidably disposed through rectangular slots in a pair of vertical support arms suspended from the frame members on the horizontal forward bed portion. The restraining arms are slotted on the underside of their forward end portions to securely lock within the forward vertical support arms when the rear bed portion is in the horizontal load carrying position.