A support apparatus is disclosed for securing a material moving wing plow relative to a vehicle. The support apparatus includes a beam having a first and a second end, the beam being rigidly secured to the vehicle. A plate having a first and a second extremity is rigidly secured to the beam. A first trailing link is pivotally secured to the plate about a first pivotal axis. A second trailing link is pivotally secured to the plate about a second pivotal axis. A support arm is provided for supporting the wing plow. The support arm has a first termination and a second termination and is pivotally secured to the first trailing link about a third pivotal axis. Also, the support arm is pivotally secured to the second trailing link about a fourth pivotal axis. The first, second, third and fourth pivotal axes are spaced and parallel relative to each other so that when the vehicle moves in a forward direction, the third and fourth pivotal axes trail behind the first and second pivotal axes relative to the forward direction of the vehicle. The arrangement is such that during a plowing operation, the wing plow supported by the support arm moves smoothly over the material being moved so that a potentially dangerous diving of the wing plow into the material in a vicinity of the support arm is avoided.