Which of the following does not fall under the definition of a travel trailer?

The definition of a travel trailer typically includes vehicles or structures that are specifically designed for temporary living purposes, particularly for leisure activities such as camping or travel. Travel trailers are meant to be towed and are generally associated with mobility.

A stationary building does not fit this definition, as it implies a structure that is fixed in one location and not intended for mobility. In contrast, temporary living units, vehicles designed for leisure travel, and portable camping structures all imply a certain level of mobility and the ability to move from one location to another, which align with the characteristics of travel trailers.

Thus, identifying a stationary building as something that does not fall under the definition of a travel trailer is accurate due to its lack of portability and the nature of its use.