Abstract: An upper rail configuration for mounting a wheeled trolley assembly for mounting curtains on a curtain side trailer has removable and replaceable inserts which have a configuration a complementary to the upper rail configuration. A top portion of each insert fits into a slot in the upper rail and the bottom of each insert rests on a shelf of the upper rail. Once worn, these inserts can be replaced in the field at a fraction of the cost of completely new upper rail.

Abstract: The invention relates generally to an apparatus for use with curtain side trailers, including a pillar with a hydraulic dampening device and two members, and providing a way for the pillar to be locked and released from lateral movement along a railing or framework. The invention is generally used as an intermediary support for the curtain and the roof, and extends from the trailer bed to the roof. Since the pillars can move laterally along the railing or framework once released and opened, the width for loading and unloading is increased. The dampening device of present invention helps with safety issues of prior inventions by decreasing the velocity of the opening pillar.