The Sims: SuperstarEdit
The Star Trailer is a toilet introduced in The Sims: Superstar for Sims in the Fame career who have at least 2 stars. It can only be placed on community lots. Sims with 2 or more stars can use it to restore bladder and comfort, but if a Sim outside of the Fame career, or with fewer than 2 stars, tries to use it, they will literally be kicked out.
In the default layout of Studio Town, the Star Trailer can be found in Fairchild Film Studios, Meeker Studios, and the Midlock Multiplex. Basically, it is found on almost every lot that has objects dealing with acting, with the exception of the Midlock Multiplex.
If a superstar (Sims with stars over their heads) goes in the trailer, other Sims cannot use it while they are in there, but the player can choose the option "Play In". Sims who do not have at least two stars will still be kicked out, though.
The Sims 3: Late NightEdit
The Professional Actor Trailer is a prop introduced in The Sims 3: Late Night, and is unlocked when a Sim reaches Level 10 of the Acting branch of the Film career. It is a rabbit hole, and Sims can sleep in it. Sims can even WooHoo in it, though they may get caught by the paparazzi.
The Actor Trailer can be placed on a Sim's home lot. Like gifts that are received from work and other Sims, it is usually placed in the family inventory.