A vehicle tire tie-down winch and chock assembly ties down at least one tire of a vehicle on a load carrying platform with a tire harness. The load carrying platform has at least one raised rib with elongated apertures at a top surface of the rib. The assembly has a chock surface and a rotating lock mechanism with an elongated lock element which in an insertion position fits within one of the apertures in the rib and in a locking position has its longitudinal extent substantially perpendicular to a longitudinal extent of the elongated aperture to engage the aperture. At least one hook is engageable in another of the elongated apertures of the rib or in an elongated aperture of another rib at the platform. A winch is provided on the assembly which secures to an end of the tire harness. The winch may have a foot pedal release.