Parts List exploded view architectural information for Modular Exhibit Truss System C21_123. 20×20 Trade Show Perimeter Booth. 12″ wide Triangular Truss by edt exhibit and display truss and lds light design systems. modular truss system that breaks down into 2 small trade show sizes. durable and lightweight aluminum that can be continuously expanded and last a long time with recyclable parts. dont settle for pop up trade show display or pop up trade show banner when you can buy a long lasting modular display booth