Pre-Rigged Truss. Aluminum alloy structures that allows the lighting fixtures to ride inside, saving truck space and time and labor. Conventional PRT contains two six-lamp PAR-bars. PRT/Club Trussing - Double Hung*Applied Electronics Automated truss has a mechanism for the fixtures to be lowered out the bottom, Moving Light Truss Moving Lighting Truss Moving Light Supertruss Moving Lighting Truss Systems or sides that fold up, Tomcat - Swing Wing Truss or rides on dollies. HUD™ Truss PRG BAT truss.