Tire/road noise is a highly relevant topic for improving the comfort and experience of drivers and residents living in high-traffic areas. With growing numbers of electric cars, the relevance of tire noise even increases since it is the dominant sound source in the middle-speed range.Existing standards concerning tire/road noise typically only require acoustic pressure or intensity level measurements, and no further investigation of sound source locations or strengths is carried out. Therefore our goal is to apply different sound source localization algorithms at the rolling tire using a measurement trailer equipped with microphone arrays. The first step to achieve a robust workflow for field measurements is to test the measurement setup and identify the acoustic properties of the trailer in the stationary case. For this purpose, an artificial sound source is placed inside the stationary trailer. In this contribution, we present the characterization process and results of the sound source localization in this stationary case.