Stage trucks are platforms, like a low rostra, but fitted with wheels to enable them to be quickly and quietly moved in to place on stage. The truck can have a simple scene set on it, complete with furniture, props and possibly even some form of backing. If most of a play is set in one setting, a truck can be used to create a separate area that can be confined by careful lighting. It might be hidden behind curtains on the main set and moved in to position as needed, then hidden away again.
From the front of the truck the wheels will not be seen, but the wheels at the back should be a type with brakes that lock easily to prevent the truck from moving when the cast step on and off, or move around on it.
Cross-section of typical simple stage truck.
copyright Leigh Graham 1997-2010.