•Prior to any assembly the interior height of the trailer must be determined.  Once that height is know, the (2) telescoping vertical frame members must be set to approximately 3” less that that interior height. These vertical tubes are adjustable in 3” increments by sliding apart to the proper length then inserting the bolt, lock washer and wing nut provided through the pre-drilled holes in both pieces.  When installing these vertical tubes into the curtain by sliding them into the (2) pipe pockets provided care must be taken that the wingnuts face the center of the curtain so that they do not abrade the curtain over time through repetitive use.