US Patent 9352714 Adjustable side under-ride guard for sliding axle trailer

A side under-ride collision guard is described that is configured to be mounted on a large trailer that has been equipped with a sliding rear axle, consisting of one or more energy absorbing beam structures axially adjustable for position attached to a multiplicity of parallel rails to diminish the impact hazard to other roadway users that is presented by the lower axial edge(s) of the cargo compartment in the region(s) that are present between the trailer's rear most tires and the trailer's rear under-ride guard and/or between a stationary forward under-ride guard and the trailer's front most tires.