Which of the following statements is true regarding a house trailer?

The statement that a house trailer can be built on a permanent chassis and is less than 45 feet in length is true because it aligns with the definitions commonly used in transportation law. A house trailer, often referred to as a mobile home or manufactured home, is typically designed to be transported and placed in a residential setting. The maximum length requirement of less than 45 feet is consistent with regulations that categorize such trailers to ensure safe travel on highways while adhering to size limits established to reduce hazards or complications for other vehicles.

The other statements provide information that does not accurately depict the characteristics of a house trailer. For instance, the incorrect length specification of 30 feet does not encompass the standard size for many modern trailers. Additionally, stating that a house trailer cannot be transportable contradicts its fundamental purpose, as these structures are specifically manufactured to be movable. Finally, the requirement for a house trailer to be equipped with a motor is misleading, as house trailers are typically towed by vehicles, rather than being motorized themselves. Thus, option A correctly describes the intended design and regulations surrounding house trailers.