A mobile office is an office built within a truck, motorhome, trailer or purpose built shipping container. Most common are towable offices built on an axled iron frame for easy relocation. Mobile field offices are often found on construction sites, or at disaster scenes where a temporary office space is needed. Typically, mobile offices in North America feature a single phase split (240 volt center-tapped) electric service that is connected to a nearby source of power, to run small window-unit air conditioners, and the like. There are many types of companies that sell, lease, rent new and used storage containers, portable buildings or modular buildings. This type of construction shortens the construction period as the building can be built in a factory in as little as six weeks and the sit