Pit Canopy
A typical "back drop to trailer" is a fabric panel used on "rise above" canopies. This vertical panel closes off the gap between the elevated top of the canopy frame and the trailer roof. A zippered connector for the back drop is standard on a Larsen "rise above" style canopy. Another method of filling this...
Bally Curtains is a term sometimes used in the industry for Half Height Skirts. Please see "Half Height Skirts"
Half height (privacy) poles typically come with adjustable collars. This allows the horizontal pole to be raised or lowered depending on the set up surface. This pole is used to hang "half height skirts" or to act as a "sill" for zip down windows.