Testing in terrestrial gravity can never provide the full picture of planetary wheel-terrain interactions. In preparation for parabolic flights with a prototype ExoMars Rover wheel driving on ES-2 Mars simulant at equivalent Martian gravitational acceleration, automated soil preparation and the structural analysis of the experimental apparatus have turned out to be the most substantial tasks. This work describes how soil preparation can be adapted to the extreme constraints of parabolic flights, and how output port diameter and spacing affect soil loosening performance. It also provides an overview of the planned in-flight experimentation campaign that includes testing of soil preparation quality, extensive wheel-soil interaction experiments, and links of these datasets to telemetry.