Patent ID: 8690219

Claim:
A system comprising a trailer, the trailer comprising: a bed defining a rectangular area that is bounded by four walls, the four walls comprising a first wall; and a second wall facing the first wall, the first wall and the second wall rising vertically from the bed to a distal end; a first cap-rail atop the first wall; and a second cap-rail atop the second wall; a plurality of telescoping extension poles vertically positioned within each of the first wall and the second wall; each telescoping extension pole in the plurality of telescoping extension poles comprises a plurality of pole sections, the plurality of pole sections comprising a pole top-section and a pole bottom-section; each telescoping extension pole in the first wall is connected at the pole top-section to the first cap-rail and immobilized at the pole bottom-section; each telescoping extension pole in the second wall is connected at the pole top-section to the second cap-rail and immobilized at the pole bottom-section; and each pole top-section is extensible upward above the distal end; a lock securing the plurality of pole sections in position with respect to each other when the pole top-section extends above the distal end; and wherein each telescoping extension pole defines an opening extending horizontally through each telescoping extension pole, said opening being accessible when the lock secures the plurality of pole sections in position; and further comprising a horizontal beam that fits within each opening to structurally connect telescoping extension poles.