Abstract: Stabilizing apparatus for a dump vehicle including a dump box pivotally movable about a frame between lowered and elevated conditions utilizes two leg members each having two end sections which are movable relative to one another in a telescoping fashion and hydraulic cylinders for telescopically moving the end sections of each leg members relative to one another. One end of each leg member is connectable to the dump box adjacent a corresponding side thereof for pivotal movement relative thereto between a first condition at which the leg member is positioned generally alongside the box for storage and a second condition at which the leg member extends angularly downwardly from the box for engagement of the other end section of the leg member with the ground.