Abstract: A ramp for use with a flat bed trailer, the ramp pivotally coupled proximate an end margin of the trailer and being shiftable between a loading disposition and a transport disposition, the ramp includes a load support structure. A hinge mechanism is pivotally coupled to the load support structure and the trailer proximate the trailer end margin, the hinge mechanism biasing the load support structure toward an intermediate, neutral disposition. A first hinge pin is fixably coupled proximate the end margin of the trailer and shiftably coupled to the hinge mechanism, the first hinge pin allowing the ramp to be laterally shifted to a multiplicity of positions across the width of the trailer as desired. A hinge mechanism and a trailer are also included.