[header] How to set up a restroom trailer [title] Choose an appropriate size. [step] The size of the trailer you will need will be determined by the number of estimated people who will attend the event, how long the event will run and whether food and beverages will be served. Restroom trailers are normally sized in terms of number of " stations ". 
This is the number of toilets and urinals that can be used at the same time. For example if a restroom trailer has 4 toilet stalls for both males and females and 2 urinals this would be a 6 " station " restroom trailer.